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PHY 104 PHY 104 Past Questions Objective Question
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Question

The work function of a particular metal is 2.00 eV. If the metal is illuminated with monochromatic light of wavelength 550 nm, what is the required stopping potential?
Options
A 0.26 V
Correct Answer
B 1.02 V
C 1.02 V
D 0.75 V
Correct Answer

Option A is the correct answer.

Detailed Explanation

Photon energy E = hc/λ = 1240 eV·nm / 550 nm = 2.2545 eV. Work function φ = 2.00 eV. K_max = E - φ = 0.2545 eV. Stopping potential V₀ = K_max / e = 0.2545 V ≈ 0.26 V.

Hint

Use the photoelectric equation: eV₀ = hf - φ = hc/λ - φ.

Question Info

Course: PHY 104
Topic: PHY 104 Past Questions
Type: Objective
Difficulty: Not specified
Question 792 of 947
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