In the photoelectric effect, what happens to the kinetic energy of emitted elect

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Question: In the photoelectric effect, what happens to the kinetic energy of emitted electrons if the frequency of incident light is increased?

Options:

Correct Answer: It increases linearly with frequency

Solution:

The kinetic energy of emitted electrons increases linearly with the frequency of the incident light, according to the equation KE = hf - φ.

In the photoelectric effect, what happens to the kinetic energy of emitted electrons if the frequency of incident light is increased?

In the photoelectric effect, what happens to the kinetic energy of emitted electrons if the frequency of incident light is increased?

Correct Answer: Kinetic energy increases.

Step 1: Understand the photoelectric effect. This is when light hits a material and causes it to emit electrons.
Step 2: Know that light can be thought of as made up of particles called photons.
Step 3: Each photon has a certain amount of energy, which depends on its frequency. Higher frequency means more energy.
Step 4: The energy of a photon is given by the formula E = hf, where E is energy, h is Planck's constant, and f is frequency.
Step 5: When a photon hits an electron, it can give the electron enough energy to escape from the material.
Step 6: The kinetic energy (KE) of the emitted electron is calculated using the formula KE = hf - φ, where φ is the work function (the energy needed to release the electron).
Step 7: If the frequency (f) of the incident light increases, the energy (hf) of the photon increases.
Step 8: Since φ (the work function) is constant for a given material, an increase in hf means that KE will also increase.
Step 9: Therefore, the kinetic energy of the emitted electrons increases linearly with the frequency of the incident light.

Photoelectric Effect – The phenomenon where electrons are emitted from a material when it is exposed to light of sufficient frequency.
Kinetic Energy of Electrons – The energy that the emitted electrons possess, which is determined by the frequency of the incident light and the work function of the material.
Planck's Equation – The relationship KE = hf - φ, where KE is the kinetic energy of emitted electrons, h is Planck's constant, f is the frequency of the incident light, and φ is the work function.