Why fossil fuel has been used more in the existing world? ​

1. The frequency of green light with a wavelength of 503 nm is approximately\(5.97 x 10^14 Hz\), 2. The wavelength of a photon with an energy of \(7.89 * 10^(-19)\)J is approximately 252 nm.

1. The frequency of light can be calculated using the equation:

frequency = speed of light / wavelength.

Given the wavelength of green light as 503 nm (nanometers) and the speed of light (c) as \(3.00 * 10^8\)m/s, we need to convert the wavelength to meters before calculating the frequency.

\(1 nm = 1 * 10^(-9) m.\)

So, the wavelength in meters is: \(503 nm * (1 * 10^(-9) m/nm) = 5.03 * 10^(-7) m.\)

Now we can calculate the frequency using the equation:

\(frequency = (3.00 * 10^8 m/s) / (5.03 * 10^(-7) m) = 5.97 * 10^14 Hz.\)

Therefore, the frequency of green light with a wavelength of 503 nm is approximately 5\(.97 * 10^14 Hz.\)

2. The energy of a photon can be calculated using the equation:

energy = Planck's constant * frequency.

Given the energy as \(7.89 * 10^(-19)\)J (joules) and the Planck's constant (h) as \(6.626 * 10^(-34)\)J • s, we can rearrange the equation to solve for the frequency:

frequency = energy / Planck's constant.

Substituting the given values, we have:

\(frequency = (7.89 * 10^(-19) J) / (6.626 * 10^(-34) J • s) ≈ 1.19 * 10^15 Hz.\)

Now we can use the frequency to calculate the wavelength using the equation:

wavelength = speed of light / frequency.\(10^9\)

Given the speed of light as 3.00 x 1\(0^8\)m/s, we can calculate the wavelength:

wavelength = (3.00 x\(10^8\)m/s) / (1.19 x \(10^15\)Hz) ≈ 2.52 x \(10^(-7)\)m.

Finally, converting the wavelength to nanometers:

wavelength = 2.52 x\(10^(-7)\)m * (1 x \(10^9\)nm/m) ≈ 252 nm.

Therefore, the wavelength of a photon with an energy of 7.89 x \(10^(-19)\)J is approximately 252 nm.

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Answer:

No, gravitational force is a force having infinite range. It only reduces to an extent that astronauts cannot feel it.

Explanation:

Given parameters:

Distance traveled  = 176m

Initial velocity  = 2.3m/s

Unknown:

Acceleration  = ?

Solution:

Acceleration is the change in velocity with time. To solve this problem, we apply one of the motion equations;

              V²   = U²  + 2as

 where V is the final velocity

              U is the initial velocity

               a is the acceleration

               s is the distance

       final velocity is 0;

                   0²  = 2.3² + 2 x a x 176

                   -5.29  = 352a

                    a  = - \(\frac{5.29}{352}\)   = - 0.015m/s²

The force required to move the 90 Kg object at a constant speed of 8.10 m/s is 138.94 N

The force required to keep an object moving in a circle is called Centripetal force. This is defined according to the following equation:

F = mv²/r

With the above formula, we can obtain the force required to move the 90 Kg object. Details below:

F = mv²/r

F = (90 × 8.10²) / 42.5

F = (90 × 65.1) / 42.5

F = 5904.9 / 42.5

F = 138.94 N

Thus, the force required is 138.94 N

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The measured initial kinetic energy (J) of the bullet is 158.70 J.

So, the correct answer is A.

We know that the initial kinetic energy (KE) of the bullet is given by:

KE = (1/2) mv²

Where,m = mass of the bullet

v = velocity of the bullet

So, the initial kinetic energy of the bullet can be calculated as:

KE = (1/2) mv²

KE = (1/2) (m) (v)²

To determine the initial kinetic energy of the bullet in Joules, we can use the formula KE = 1/2mv², where m is the mass of the bullet and v is its velocity.

From question 13, we know that the mass of the bullet is 0.023 g, which is equal to 0.023/1000 kg. We also know that its velocity is 330 m/s.

Plugging these values into the formula, we get KE = 1/2 x 0.023/1000 x (330)²= 158.7 J.

Therefore, the measured initial kinetic energy of the bullet is option A, 158.70 J.

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Answer:

Big Q represents the source charge which creates the electric field. Little q represents the test charge which is used to measure the strength of the electric field at a given location surrounding the source charge.

The source charge, or Big Q, is what generates the electric field. Little q stands for the test charge, that is used to gauge the intensity of the electromagnetic field around the source charge at a certain position.

Charged material experiences a force when it is exposed to an electromagnetic field because of the physical characteristic of electric charge.

You can have a positive or negative electric charge. Unlike charges attract one another, while like charges repel one another. Neutral refers to an object that carries no net charge.

Classical electrodynamics, the name given to early understanding of how charged particles interact, is still accurate for issues that do not call for taking into account quantum phenomena.

Electric current is a conserved attribute, meaning that the net charge—that is, the sum of the positive and negative charges in an isolated system—cannot change.

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Given that spring constant, k = 100 N/m and displacement, x = - 5mm = - 0.005 m

The formula of restoring force according to Hooke's law,

Substituting the values, we get

Thus, the force is 0.5 N

Answer:

yellow I do believe.........

Based on the options, we can predict that the color of light that will be absorbed the least by the spinach extract is:

A. Green

This is because spinach leaves contain chlorophyll, which reflects green light while absorbing other colors like blue and red for photosynthesis. Therefore, green light will be absorbed the least by the spinach extract.

Chlorophyll is a synthetic photoreceptor that plants use to capture light for photosynthesis. Because the three fundamental colours do not absorb the green wavelength, they reflect it, giving plants their distinctive green shade.

Thus, red light will probably be absorbed the least by the spinach extract whereas green light would probably be absorbed the most.

Green light, in my opinion, will be the one that the spinach extract absorbs the least of.

This assumption is supported by the presence of chlorophyll in spinach, which primarily absorbs blue and red light for photosynthesis and reflects green light, giving leaves their green hue.

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If a ball is given a push so that it has an initial velocity of 2 m/s down a certain inclined plane, then the distance it has rolled after t seconds is s = 2t + t². Then it takes 11 seconds for the velocity to reach 24 m/s. The correct option is D.

To find the time it takes for the velocity of the ball to reach 24 m/s, we need to solve for the time when the velocity function equals 24 m/s.

The velocity function is the derivative of the distance function, so we'll first find the derivative of the distance function s = 2t + t² with respect to time t:

ds/dt = d/dt(2t + t²)

ds/dt = 2 + 2t

Now we can set the velocity function equal to 24 m/s and solve for t:

2 + 2t = 24

Subtracting 2 from both sides:

2t = 22

Dividing both sides by 2:

t = 11

Therefore, it takes 11 seconds for the velocity to reach 24 m/s.

The correct answer is (d) 11 seconds.

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The orbital period of the Earth around the Sun is determined by its distance from the Sun and its mass. If the Earth had twice its present mass but orbited at the same distance from the Sun, its gravitational attraction to the Sun would be stronger, resulting in a longer orbital period. Using Kepler's third law of planetary motion, we can calculate the new orbital period as follows:

T^2 = (4π^2/G) x (r^3/m)

where T is the orbital period, G is the gravitational constant, r is the distance from the Earth to the Sun, and m is the mass of the Earth.

Plugging in the values, we get:

T^2 = (4π^2/6.6743 x 10^-11) x [(149.6 x 10^6)^3 / (2 x 5.9722 x 10^24)]
T^2 = 1.085 x 10^20
T = √(1.085 x 10^20)
T = 1.09 x 10^10 seconds

Converting this to years, we get:
T = 346 years

Therefore, if the Earth had twice its present mass but orbited at the same distance from the Sun as it does now, its orbital period would be approximately 346 years.

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Answer:

10:30am ........................

Answer:

maybe around 10:30 I would say

The correct answer is (c) There are three times as many wavelengths, and each wavelength is three times as long.

According to Bohr's theory, electrons in an atom occupy specific energy levels, or orbits, characterized by specific radii. The de Broglie wavelength of an electron is related to its momentum and is given by the equation λ = h / p, where λ is the wavelength, h is the Planck's constant, and p is the momentum.

When an electron moves from the n1 level to the n3 level, it transitions to a higher energy level, which corresponds to a larger radius for the electron's orbit. As the radius increases, the circumference of the orbit also increases. Since the circumference is related to the wavelength, the new orbit will have a different number of wavelengths compared to the previous orbit.

In this case, the new orbit will have three times as many wavelengths as the original orbit, and each wavelength will be three times as long because the radius of the orbit has increased. Therefore, option (c) is the correct explanation for why the circumference of an electron's orbit becomes nine times greater when it moves from the n1 level to the n3 level.

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The S.I. unit of E is NC^-1 and that of B is NA^-1 m^-1, then unit of E/B is A m/C (ampere meter per coulomb). This unit represents the ratio between the electric field and the magnetic field, indicating the strength and direction of the electromagnetic field.

The SI unit of electric field (E) is NC^(-1) (newton per coulomb) and the SI unit of magnetic field (B) is NA^(-1) m^(-1) (tesla). To determine the unit of E/B, we need to divide the unit of E by the unit of B.

Dividing the unit of E (NC^(-1)) by the unit of B (NA^(-1) m^(-1)), we can simplify the expression:

E/B = (NC^(-1))/(NA^(-1) m^(-1))

To simplify this expression, we can cancel out the common units in the numerator and denominator:

E/B = (N/C)/(N/(A m))

Now, let's simplify further by dividing the numerator and denominator:

E/B = (N/C) * (A m/N)

Canceling out the common units:

E/B = (A m)/(C)

Therefore, the unit of E/B is A m/C (ampere meter per coulomb).

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ANSWER:

IV, Type of dish detergent. DV, height of foam. CV, type of container, amount of water in container, temperature of water, time the container is agitated.

Explanation:

Independent variable(IV)- what you change during the experiment.

dependent variable(DV)- what you're measuring during an experiment. The dependent variable is DEPENDENT because it's results DEPEND on the independent variable at play.

Constant variables(CV)- things that do not change in order to isolate the tested variables as much as possible.

The value in electronics that is most similar to water pressure expressed in psi is the electrical potential difference, also known as voltage. Both water pressure and voltage are used to measure the force or energy that is present in a system..

Water pressure is a measure of the force that water exerts on its surroundings. It is commonly measured in psi, which stands for pounds per square inch. This measurement tells us how much pressure there is in a given area of space. In electronics, there is a similar value that is used to measure the force or energy present in a system. This value is known as the electrical potential difference, or voltage.

Voltage is a measure of the energy that is available to do work in an electrical system. It is usually measured in volts (V).

Voltage tells us how much potential energy there is in a given electrical circuit. This potential energy can be used to power devices, generate heat, or perform other types of work that require energy. Voltage is similar to water pressure because both measurements tell us how much force or energy is present in a system.In electronics, voltage is often used to power devices such as lights, motors, and computers. It is also used to generate heat, as in the case of electric heaters. Voltage is a fundamental property of electricity, and it is one of the most important values in electronics.

The value in electronics that is most similar to water pressure expressed in psi is the electrical potential difference, also known as voltage. Both water pressure and voltage are used to measure the force or energy that is present in a system. Voltage is a fundamental property of electricity, and it is one of the most important values in electronics.

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Answer:  12 Hertz

==========================================

Work Shown:

Frequency = (velocity)/(wave length)

Frequency = (600 m/s)/(50 m)

Frequency = (600/50) s^(-1)

Frequency = 12 Hertz

Note: 1 Hertz (abbreviated Hz) is one cycle per second. One way we can define what the cycle is, is to measure from one peak of the wave to the next neighboring peak. This is what the wavelength is. So saying "12 Hz" is basically saying "12 wavelengths per second".

By using the blackbody radiation formula, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

We need to know about black body radiation to solve this problem. The energy radiated by a black body object is proportional to the area and the fourth power of temperature. It can be determined as

P = A . e . σ . T⁴

where P is power, A is surface area, e is emissivity, σ is Stefan Boltzmann's constant ( 5.67 x 10¯⁸ W/m²K⁴) and T is temperature.

From the question above, we know that

P1 = 10 watt

P2 = 100 watt

T1 = T1

By using the black body radiation formula, the ratio of temperature is

T1⁴ / T2⁴ = P1 / P2

Hence,

T1⁴ / T2⁴ = P1 / P2

T1⁴ / T2⁴ = 10 / 100

T1⁴ / T2⁴ = 1 / 10

T2⁴ = 10T1⁴

T2 = ⁴√(10T1⁴)

T2 = T1 x 10⁰'²⁵

Thus, the temperature of the filament inside the bulb is changed by a factor of 10⁰'²⁵.

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Answer:

hgt tdyrghgcderhgfe

Explanation:

rghttyhhhggggftttgf d's weyhvfswertfcdsettyhgftgdfvhgg fee e4y

Answer:

The battery it consider as one of the circuits elements.

the answer is c because it has the most volts

a

A student observes a star from two positions of Earth in its orbit, in summer and winter, and measures the change in the position of the star. The best calculated by this method is the distance of the star from the Sun using the parallax method.

What is Parallax method?

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Answer:

Below

Explanation:

They are not equivalent. but to find out the mass which weighs Newtons

   divide Newtons by 'g '         Newtons/ (9.81 m/s^2) = KG   (on earth)

Ultrasonic beams are often used for milk because they have the ability to detect any changes or irregularities in the milk, such as the presence of air bubbles, fat globules, or other foreign particles.

By sending out high-frequency sound waves into the milk, the ultrasonic beams are able to bounce off these particles and provide a detailed image of the milk's composition. This information can be extremely useful for dairy farmers and milk processors, as it allows them to monitor the quality and consistency of their product, detect any potential contamination, and ensure that their milk meets the necessary standards and regulations. Ultrasonic technology is also non-invasive and does not require any chemical additives, making it a safe and effective way to test milk without altering its composition or taste. Overall, the use of ultrasonic beams for milk provides an efficient and accurate way to analyze and monitor the quality of this important agricultural product.

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The correct order of increasing impedance is:

C. PZT, gel, skin, matching layer

Impedance is a measure of the opposition to the flow of sound waves in a medium. It depends on the density and speed of sound in the material. In the given options, the order of increasing impedance can be determined by considering the properties of the materials involved.

PZT (lead zirconate titanate) has a higher impedance than gel, skin, and the matching layer. PZT is a piezoelectric material commonly used in ultrasound transducers and has a higher density and speed of sound, leading to higher impedance.

Gel has a lower impedance compared to PZT but higher impedance than skin and the matching layer. Gel is used as a coupling medium between the transducer and the skin to enhance acoustic coupling and minimize impedance mismatch.

Skin has a lower impedance than both gel and the matching layer. It is the outermost layer and acts as an interface between the transducer and the biological tissue.

The matching layer has the lowest impedance among the given options. It is designed to match the impedance of the PZT to the impedance of the tissue being imaged, facilitating efficient sound transmission.

Therefore, the correct order is C.

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The horizontal component of the force is 57.4 N and the vertical component of the force is 46.4 N (option A)

The horizontal component of the force can be obtained as follow:

Horizontal component of force (Fx) = F × Cosθ

Fx = 73.8 × Cos 39

Fx = 57.4 N

Thus, the horizontal component of force is 57.4 N

The vertical component of the force can be obtained as follow:

Vertical component of velocity (Fy) = u × Sine θ

Fy = 73.8 × Sine 39

Fy = 46.4 N

Thus, the vertical component of force is 46.4 N

Therefore, the correct answer to the question is Fx = 57.4 N and Fy = 46.4 N (option A)

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Since chloride ions are not part of the ionic equilibrium, addition of chloride ions will only increase the concentration of the anions in the solution.

An ionic equilibrium is an equilibrium that exists between two or more ions in an aqueous solution.

The ionic equilibrium between iron (iii) ion and thiocyanate ions is given below:

\(Fe^{3+}\rightleftharpoons SC \: N^{-}\)

From the principle of equilibrium, addition of either ions in the ionic equilibrium will alter equilibrium position to the left or right.

Addition of chloride ions, Cl- which is not a part of the ionic equilibrium will only increase the concentration of the anions in the solution.

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The chloride ions are not part of the ionic equilibrium, adding them to the solution will merely raise the concentration of anions.

When a chemical reaction does not convert all reactants to products, it reaches equilibrium. Many processes attain a state of balance, or dynamic equilibrium, in which both reactants and products are present.

The following is the ionic equilibrium between iron (III) ion+ and thiocyanate ions:

\(\rm Fe^{3+} \rightleftharpoons SC \ N^{-}\)

The addition of either ion in the ionic equilibrium will shift the equilibrium position to the left or right, according to the principle of equilibrium.

The inclusion of chloride ions, Cl-, which are not components of the ionic equilibrium, increases the levels of anions in the solution.

Thus, the chloride ions are not part of the ionic equilibrium, adding them to the solution will merely raise the concentration of anions.

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Answer:

960 in^3

Explanation:

Given data

Length= 24in

Width= 10in

Height = 12in

The volume of the tank

V= L*W*H

Substitute

V= 24*10*12

V= 2880 in^3

The volume of the water in the tank is

V=24*10*8

V=1920 in^3

Hence the volume of water need to fill the tank is

=2880-1920

=960 in^3

Since we know that kinetic energy equals work done, kinetic energy will produce more in the first scenario.Because the first case's work was more than the second, kinetic energy exists.

Does kinetic energy vary as a result of work?

According to the work-energy theorem, the net work performed by forces acting on an item equals the change in kinetic energy.

When does kinetic energy become more significant?

The kinetic energy of an object, in contrast to potential energy, is relative to other fixed and moving things that are present in its immediate vicinity. For instance, if the object is positioned at a higher height, its kinetic energy will be higher

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The vertical force to balance the force of gravity on the pendulum bob is tension in the string.

The correct option is (d) tension in the string.

The tension in the string provides the necessary centripetal force that balances the weight of the bob, ensuring that it moves in a circular path. The force of gravity acts downward on the bob of a pendulum and provides the tension in the string to act as an upward force to balance the force of gravity. Hence, the correct option is (d) tension in the string. Gravity, friction, centripetal force, and force from Newton's third law are forces that affect the movement of a pendulum. These forces do not provide the vertical force to balance the force of gravity on the pendulum bob.  The force ma is used to determine the angular acceleration (α) of the pendulum using the equation τ = Iα. where τ is the torque and I is the moment of inertia.

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