The threshold frequency of a metal is 3.3 × 10¹⁴ Hz. If light of frequency 8.2 × 10¹⁴ Hz is incident, find the photoelectric cut-off voltage.
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Question

The threshold frequency of a metal is 3.3 × 10¹⁴ Hz. If light of frequency 8.2 × 10¹⁴ Hz is incident, find the photoelectric cut-off voltage.

G1 Physics · Accepted Answer

Stopping potential Vₛ = h(ν−ν₀)/e. With ν−ν₀=4.9×10¹⁴ Hz, Vₛ≈2.0 V. Correct answer: C.