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Physics-(general)

NEET Physics (general) MCQ Question

Type: MCQ-numerical-Easy-Class 12

What is the threshold frequency f0f_0 of a metal with a work function of 3.0 eV?

A

7.25 × 10^14 Hz

B

56 × 10^14 Hz

C

5.32 × 10^14 Hz

D

6.02 × 10^14 Hz

Correct Answer

Option A

Detailed Explanation

Using the equation f0=ϕhf_0 = \frac{\phi}{h}, where ϕ=3.0 eV=3.0×1.6×10−19 J\phi = 3.0 \text{ eV} = 3.0 \times 1.6 \times 10^{-19} \text{ J}, and h=6.63×10−34 J sh = 6.63 \times 10^{-34} \text{ J s}, we find f0=3.0×1.6×10−196.63×10−34=7.25×1014 Hzf_0 = \frac{3.0 \times 1.6 \times 10^{-19}}{6.63 \times 10^{-34}} = 7.25 \times 10^{14} \text{ Hz}.

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