Photoelectric Effect
Physics ⇒ Modern Physics
Photoelectric Effect starts at 10 and continues till grade 12.
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A metal has a work function of 4.0 eV. What is the threshold wavelength for this metal? (h = 6.63 × 10-34 J·s, c = 3.0 × 108 m/s, 1 eV = 1.6 × 10-19 J)
A metal surface is illuminated with light of frequency 1.2 × 1015 Hz. The work function of the metal is 3.0 eV. Calculate the stopping potential required to stop the most energetic photoelectrons. (h = 6.63 × 10-34 J·s, 1 eV = 1.6 × 10-19 J)
Describe one practical application of the photoelectric effect.
Describe the effect of increasing the intensity of incident light (with frequency above threshold) on the photoelectric current.
Describe the relationship between the threshold frequency and the work function of a metal.
Explain why no electrons are emitted from a metal surface if the frequency of incident light is below the threshold frequency, regardless of the light’s intensity.
Explain why the photoelectric current becomes constant (saturates) at high intensities of incident light.
Explain why the photoelectric effect cannot be explained by the classical wave theory of light.
If the frequency of incident light is doubled (and is above the threshold frequency), what happens to the maximum kinetic energy of the emitted electrons?
If the frequency of incident light is just equal to the threshold frequency, what is the kinetic energy of the emitted electrons?
If the stopping potential measured in a photoelectric experiment is 1.5 V, what is the maximum kinetic energy of the emitted electrons in electron volts?
If the work function of a metal is 2.0 eV and the incident light has a frequency of 8.0 × 1014 Hz, calculate the maximum kinetic energy of the emitted electrons. (Take h = 6.63 × 10-34 J·s, 1 eV = 1.6 × 10-19 J)
State Einstein’s photoelectric equation.
The threshold frequency for a certain metal is 5.0 × 1014 Hz. What is the work function of the metal? (h = 6.63 × 10-34 J·s)
What is meant by the term 'stopping potential' in the context of the photoelectric effect?
Which experiment provided evidence for the particle nature of light?
Which of the following metals will emit photoelectrons when exposed to ultraviolet light of wavelength 200 nm? (1) Metal A: work function = 2.5 eV (2) Metal B: work function = 5.0 eV (3) Metal C: work function = 6.5 eV (h = 6.63 × 10-34 J·s, c = 3.0 × 108 m/s, 1 eV = 1.6 × 10-19 J)
Who first explained the photoelectric effect using quantum theory?
