Photoelectric Effect
Physics ⇒ Modern Physics
Photoelectric Effect starts at 10 and continues till grade 12.
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See sample questions for grade 11
A metal has a threshold frequency of 5.0 × 1014 Hz. What is its work function? (h = 6.63 × 10-34 J·s)
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?
Calculate the maximum kinetic energy (in eV) of electrons emitted from a metal with a work function of 2.5 eV when illuminated with light of wavelength 400 nm. (h = 6.63 × 10-34 J·s, c = 3.0 × 108 m/s, 1 eV = 1.6 × 10-19 J)
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.
If the frequency of incident light is less than the threshold frequency, what will be observed?
If the stopping potential for a certain metal is 1.5 V, what is the maximum kinetic energy of the emitted photoelectrons? (e = 1.6 × 10-19 C)
If the work function of a metal is 4.0 eV, what is the threshold wavelength for photoemission? (h = 6.63 × 10-34 J·s, c = 3.0 × 108 m/s, 1 eV = 1.6 × 10-19 J)
Name two applications of the photoelectric effect.
What is the effect of increasing the intensity of light above the threshold frequency on the photoelectric current?
What is the relationship between the stopping potential (V0) and the maximum kinetic energy of photoelectrons?
Which experiment provided the first clear evidence for the quantization of energy in light?
Which scientist received the Nobel Prize in Physics in 1921 for his explanation of the photoelectric effect?
Who first explained the photoelectric effect using the concept of quantized energy?
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)
A photoelectric experiment is performed with two metals, A and B. Metal A has a higher work function than metal B. If both are illuminated with the same monochromatic light (frequency above both threshold frequencies), which metal will emit photoelectrons with greater maximum kinetic energy?
Describe how the photoelectric effect experiment supports the concept of quantization of energy.
Explain why no time delay is observed between the incidence of light above the threshold frequency and the emission of photoelectrons, even at very low light intensities.
