Photoelectric Effect
Physics ⇒ Modern Physics
Photoelectric Effect starts at 10 and continues till grade 12.
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Explain why the photoelectric effect cannot be explained by the classical wave theory of light.
Explain why ultraviolet light can cause photoemission from a metal, but red light cannot, even if both have the same intensity.
If the frequency of incident light is doubled, what happens to the energy of each photon?
If the intensity of incident light is doubled, what happens to the number of photoelectrons emitted?
State the effect of increasing the intensity of light on the kinetic energy of photoelectrons, keeping frequency constant.
What happens to the stopping potential if the frequency of incident light increases, keeping intensity constant?
A metal has a work function of 2.5 eV. Light of wavelength 400 nm is incident on it. Will photoelectrons be emitted? (h = 6.63 × 10-34 J·s, c = 3 × 108 m/s, 1 eV = 1.6 × 10-19 J)
A metal surface is illuminated with light of frequency 1.5 × 1015 Hz. The threshold frequency for the metal is 1.0 × 1015 Hz. If h = 6.63 × 10-34 J·s, what is the maximum kinetic energy of the photoelectrons?
The photoelectric effect was first observed by which scientist? (1) Albert Einstein (2) Heinrich Hertz (3) Max Planck (4) Niels Bohr
Which of the following best describes the photoelectric effect? (1) Emission of electrons from a metal surface due to heat (2) Emission of electrons from a metal surface due to light (3) Emission of protons from a metal surface due to light (4) Emission of neutrons from a metal surface due to heat
Which of the following best explains why no photoelectrons are emitted below the threshold frequency? (1) Photons have insufficient energy (2) Photons are too numerous (3) Electrons are too heavy (4) Metal is too thick
Which of the following factors affects the number of photoelectrons emitted from a metal surface? (1) Frequency of light (2) Intensity of light (3) Both (4) None
The energy of a photon depends on its ______.
The photoelectric effect is the emission of ______ from a material when light shines on it.
The stopping potential is the potential required to ______ the most energetic photoelectrons.
The threshold frequency is the ______ frequency of light that can cause photoemission from a given metal.
If the frequency of incident light is less than the threshold frequency, will photoelectrons be emitted? (Yes/No)
State whether the following statement is true or false: Photoelectric current is directly proportional to the intensity of incident light, provided the frequency is above the threshold frequency.
True or False: Increasing the intensity of light always increases the kinetic energy of photoelectrons.
True or False: The photoelectric effect can occur with any frequency of light if the intensity is high enough.
