Photoelectric Effect Quiz

What is the phenomenon known as when electrons are emitted from a metal surface illuminated with suitable light?

• Photoelectric effect

• Electromagnetic radiation

• Quantum theory

• Classical physics

What is the maximum kinetic energy of the photoelectrons determined by?

• Stopping potential

• Electric current

• Intensity of light

• Frequency of light

What is the work function of a material?

• Minimum energy needed to remove an electron

• Maximum kinetic energy of photoelectrons

• Intensity of electromagnetic radiation

• Potential energy of electrons

What happens to the photoelectric effect if the frequency of the light source is below a certain value?

• No electrons are emitted

• Electrons are emitted instantly

• Kinetic energy increases

• Intensity increases

What is the cutoff frequency in the context of the photoelectric effect?

• Threshold frequency below which no electrons are emitted

• Frequency at which maximum kinetic energy is achieved

• Frequency that determines the intensity of light

• Frequency that causes instantaneous emission of electrons

What is the relationship between the intensity of light and the maximum kinetic energy of photoelectrons according to experimental results?

• Independent

• Directly proportional

• Inversely proportional

• Exponential

What does the photoelectric equation Kmax = hf - φ represent?

• Energy of the photon minus work function

• Maximum kinetic energy of the photoelectron

• Intensity of the light source

• Threshold frequency of the light

What is the significance of Planck's constant in the photoelectric effect?

• It relates energy and frequency of photons

• It determines the intensity of light

• It measures the work function

• It indicates the stopping potential

What is the time interval for the first electrons to be emitted after radiation begins to strike the surface according to classical theory?

• Seconds

• Milliseconds

• Microseconds

• Instantaneously

What happens to the number of ejected electrons as the intensity of light increases above the cutoff frequency?

• Increases

• Decreases

• Remains constant

• Becomes zero