Photoelectric Effect
Physics ⇒ Modern Physics
Photoelectric Effect starts at 10 and continues till grade 12.
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A metal surface is illuminated with two different lights: one with high intensity but low frequency, and one with low intensity but high frequency (above threshold). Which will cause photoemission?
Describe what is meant by the term 'photoelectron'.
Explain why the photoelectric effect could not be explained by classical wave theory.
Explain why ultraviolet light can cause photoemission from some metals while visible light cannot.
A metal surface is illuminated with two different lights: one with high intensity but low frequency, and one with low intensity but high frequency (above threshold). Which will cause photoemission?
If the work function of a metal is 2.0 eV and the incident light has a frequency of 8.0 × 1014 Hz, will electrons be emitted? (Planck’s constant h = 6.63 × 10-34 J·s, 1 eV = 1.6 × 10-19 J)
A certain metal has a work function of 2.8 eV. If light of wavelength 350 nm is incident on the metal, calculate the maximum speed of the emitted photoelectrons. (h = 6.63 × 10-34 J·s, c = 3.0 × 108 m/s, me = 9.11 × 10-31 kg, 1 eV = 1.6 × 10-19 J)
A metal surface is illuminated with monochromatic light of frequency 1.2 × 1015 Hz. The work function of the metal is 3.0 eV. Calculate the stopping potential required to halt the most energetic photoelectrons. (h = 6.63 × 10-34 J·s, 1 eV = 1.6 × 10-19 J, e = 1.6 × 10-19 C)
The photoelectric effect supports which model of light?
(1) Wave model
(2) Particle model
(3) Both wave and particle model
(4) Neither model
Which of the following best describes the effect of increasing the frequency of incident light above the threshold frequency on the photoelectrons?
(1) Increases their number
(2) Increases their maximum kinetic energy
(3) Decreases their number
(4) Has no effect
Which of the following is NOT a feature of the photoelectric effect?
(1) Existence of a threshold frequency
(2) Instantaneous emission of electrons
(3) Dependence of electron energy on light intensity
(4) Dependence of electron energy on light frequency
Which of the following metals will emit electrons when exposed to ultraviolet light but not to visible light?
(1) Metal with low work function
(2) Metal with high work function
(3) Metal with zero work function
(4) Metal with negative work function
The energy of a photon is given by the formula ________.
The minimum energy required to remove an electron from the surface of a metal is called the ________.
The stopping potential is the minimum 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 work function of a metal is 2.0 eV and the incident light has a frequency of 8.0 × 1014 Hz, will electrons be emitted? (Planck’s constant h = 6.63 × 10-34 J·s, 1 eV = 1.6 × 10-19 J)
True or False: Increasing the intensity of light below the threshold frequency will cause electrons to be emitted from a metal surface.
True or False: The photoelectric effect occurs instantaneously when light of frequency above the threshold is incident on a metal surface.
True or False: The photoelectric effect provides evidence for the particle nature of light.
