Photoelectric Effect
Physics ⇒ Modern Physics
Photoelectric Effect starts at 10 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Photoelectric Effect.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
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.
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)
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)
Which of the following best describes the photoelectric effect? (1) Emission of electrons from a metal surface when exposed to light (2) Emission of photons from a metal surface when exposed to electrons (3) Absorption of electrons by a metal surface when exposed to light (4) Emission of protons from a metal surface when exposed to light
Which of the following factors does NOT affect the maximum kinetic energy of photoelectrons? (1) Frequency of incident light (2) Intensity of incident light (3) Work function of the metal (4) Planck’s constant
Which of the following is NOT a characteristic of the photoelectric effect? (1) Existence of a threshold frequency (2) Instantaneous emission of electrons (3) Dependence of kinetic energy on light intensity (4) Dependence of photoelectric current on light intensity
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)
The emission of photoelectrons occurs ________ after the light is incident on the metal surface, provided the frequency is above the threshold frequency.
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 photoelectric effect demonstrates that light has ________ properties.
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 number of photoelectrons emitted per second is directly proportional to the intensity of incident light, provided the frequency is above the threshold frequency.
True or False: The photoelectric effect supports the wave theory of light.
