E1.2 Photoelectric effect and Compton Scattering

What does the photoelectric effect provide evidence for?

• The wave nature of light

• The particle nature of light

• The diffraction of light

• The dual nature of light

What happens to photons when they scatter off electrons?

• Their wavelengths reduce

• They wavelengths increase

• Their wavelength remains unchanged

• They disappear

What is the maximum kinetic energy of an emitted photoelectron due to an incident photon with a frequency of 2.0 PHz, based on the graph?

• 4 × 10⁻¹⁹ J

• 3 × 10⁻¹⁹ J

• 2 × 10⁻¹⁹ J

• 1 × 10⁻¹⁹ J

Which equation represents the relationship between maximum kinetic energy (Emax), frequency (f), Planck's constant (h), and the work function (ϕ)?

• Emax = hf - ϕ

• Emax = hf + ϕ

• Emax = hϕ - f

• Emax = hϕ + f

What is the work function of a metal if the threshold frequency for the photoelectric effect is 5.0 × 10¹⁴ Hz?

• 3.3 × 10⁻¹⁹ J

• 6.6 × 10⁻¹⁹ J

• 2.1 × 10⁻¹⁹ J

• 4.0 × 10⁻¹⁹ J

In the photoelectric effect, what happens to the kinetic energy of the emitted photoelectron if the frequency of the incident photon is doubled?

• The kinetic energy increases by a factor of four.

• The kinetic energy is doubled.

• The kinetic energy is halved.

• The kinetic energy remains the same.

How does the intensity of incident light affect the number of photoelectrons emitted from a metal surface?

• It increases the number of emitted photoelectrons.

• It has no effect on the number of emitted photoelectrons.

• It only affects the energy of the emitted photoelectrons.

• It decreases the number of emitted photoelectrons.

What determines the frequency of incident radiation needed to observe the photoelectric effect?

• The type of metal used.

• The temperature of the environment.

• The wavelength of the radiation.

• The intensity of the radiation.

What observation did Arthur Compton make when he fired X-rays at a carbon target?

• The scattered wave had a shorter wavelength than the incident wave.

• The scattered wave had a longer wavelength than the incident wave.

• The scattered wave had the same wavelength as the incident wave.

• The scattered wave disappeared completely.

What is the formula for the change in wavelength in Compton scattering?