What does the photoelectric effect demonstrate?
a) The particle nature of light
b) The wave nature of light
c) The behavior of electrons in a field
d) The scattering of light by electrons
Who first explained the photoelectric effect?
a) Niels Bohr
b) Albert Einstein
c) Louis de Broglie
d) Max Planck
In the photoelectric effect, electrons are emitted from a material when it is exposed to:
a) Ultraviolet light
b) High-frequency sound waves
c) Visible light
d) Infrared light
What is the minimum energy required to eject an electron from a metal in the photoelectric effect called?
a) Binding energy
b) Work function
c) Photon energy
d) Ionization energy
What happens if the frequency of the incident light is below a certain threshold in the photoelectric effect?
a) Electrons are ejected with higher kinetic energy
b) No electrons are ejected
c) The electrons are emitted at lower speeds
d) The light is absorbed without any ejection of electrons
Which of the following properties of light explains the photoelectric effect?
a) Amplitude
b) Wavelength
c) Frequency
d) Speed
The photoelectric effect can be explained using the concept of:
a) Wave theory
b) Quantum mechanics
c) Classical mechanics
d) Electromagnetic radiation theory
According to Einstein’s explanation of the photoelectric effect, the energy of each photon is:
a) Directly proportional to its frequency
b) Inversely proportional to its frequency
c) Independent of its frequency
d) Related to its amplitude
In the photoelectric effect, the kinetic energy of the emitted electron is:
a) Proportional to the intensity of the light
b) Inversely proportional to the frequency of light
c) Proportional to the frequency of light above the threshold frequency
d) Independent of the frequency of light
Which factor does NOT affect the kinetic energy of the emitted electrons in the photoelectric effect?
a) Frequency of the incident light
b) Intensity of the incident light
c) Work function of the metal
d) Threshold frequency of the metal
The photoelectric effect can only occur if the frequency of the incident light is:
a) Higher than a certain threshold frequency
b) Lower than a certain threshold frequency
c) Equal to the threshold frequency
d) Variable depending on the light’s intensity
Which of the following is true about the photoelectric effect?
a) The emission of electrons is dependent on the light’s intensity
b) The emission of electrons is independent of the frequency of light
c) The emission of electrons only occurs above a certain frequency threshold
d) The emitted electrons have no kinetic energy
The photoelectric effect provides evidence that light behaves as:
a) A wave
b) A particle
c) Both a wave and a particle
d) A continuous wave
In the photoelectric effect, what happens to the number of emitted electrons when the intensity of the light is increased?
a) The number of emitted electrons increases
b) The number of emitted electrons decreases
c) The energy of emitted electrons increases
d) The emission stops
The photoelectric effect supports the idea that light can be considered as:
a) A continuous wave
b) A particle-like entity called a photon
c) An electromagnetic wave with variable intensity
d) A longitudinal wave
What does the energy of the emitted electron depend on in the photoelectric effect?
a) The intensity of the light
b) The frequency of the incident light
c) The color of the light
d) The angle of incidence
Which phenomenon contradicts classical wave theory but is explained by the photoelectric effect?
a) Diffraction
b) Reflection
c) Electron emission from a metal surface
d) Refraction
In the photoelectric effect, if the intensity of the light is increased, what happens?
a) The kinetic energy of the emitted electrons increases
b) More electrons are emitted per unit time
c) The threshold frequency is lowered
d) The work function of the metal changes
Einstein’s explanation of the photoelectric effect contributed to the development of:
a) Classical mechanics
b) The theory of relativity
c) Quantum theory
d) Electromagnetic field theory
In the photoelectric effect, which of the following increases when the frequency of the light increases above the threshold frequency?
a) The number of emitted electrons
b) The intensity of the emitted light
c) The energy of the emitted electrons
d) The work function of the metal
Which property of light did Albert Einstein focus on to explain the photoelectric effect?
a) Wavelength
b) Amplitude
c) Frequency
d) Speed
If the frequency of the incident light is below the threshold frequency, the photoelectric effect will:
a) Still occur but with lower energy
b) Not occur at all
c) Occur only for certain metals
d) Cause the emission of very fast electrons
In the photoelectric effect, the energy of a photon is given by:
a) E = mc²
b) E = hf
c) E = ½ mv²
d) E = 1/2 kx²
The photoelectric effect helped confirm the concept of:
a) Light as a continuous wave
b) Quantum energy levels in atoms
c) The dual nature of light (wave and particle)
d) Light as a form of mechanical wave
In the photoelectric effect, the emission of electrons depends on:
a) The frequency of light
b) The wavelength of light
c) The intensity of light
d) The phase of light
In the photoelectric effect, which of the following must be true for an electron to be emitted?
a) The frequency of the incident light must be above the threshold frequency
b) The light must have low intensity
c) The metal must be a conductor
d) The incident light must be polarized
Which of the following occurs when the intensity of light is increased in the photoelectric effect?
a) The maximum kinetic energy of the emitted electrons increases
b) More electrons are emitted per unit time
c) The threshold frequency decreases
d) The work function increases
The photoelectric effect is an important experimental verification of which of the following principles?
a) Wave theory of light
b) Uncertainty principle
c) Quantum theory of light
d) General relativity
Which of the following is true about the photoelectric effect?
a) The intensity of light affects the energy of emitted electrons
b) Electrons are ejected when light is absorbed regardless of frequency
c) The frequency of light determines if electrons are ejected
d) All light causes the emission of electrons from metals
