Question Detail

PHY 104 Photo Electric Emission Objective Question
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Question

If the wavelength of incident light is greater than the cutoff wavelength (λ_cutoff), what will be the effect?
Options
A Electrons will be ejected with higher kinetic energy.
B Electrons will be ejected, but only after a delay.
C No electrons will be ejected from the metal.
Correct Answer
D The number of ejected electrons will increase.
Correct Answer

Option C is the correct answer.

Detailed Explanation

Page 5 states, 'Any frequency lower than the cut-off (or any wavelength greater than the cut-off value) will NOT eject electrons from the metal.' This is because longer wavelengths correspond to lower frequencies and thus lower photon energies.

Hint

Remember the inverse relationship between frequency and wavelength, and how it relates to the threshold condition.

Question Info

Course: PHY 104
Topic: Photo Electric Emission
Type: Objective
Difficulty: Not specified
Question 190 of 947
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