Question

The Work function of a metal is 3.3eV then the threshold frequency is
(A) 8 × 10^14 Hz

(C) 5 × l0^10 Hz

(B) 8 × 10^20 Hz

(D) 4 × 10^14 Hz​

Answer 1

Work function of the metal = 3.3 eV

We know that ,

Work Function = Threshold Frequency × Plank's constant

W = hV

$V = \frac{W}{h} \\ V = \frac{3.3 \times {10}^{ - 19} }{6.6 × {10}^{ - 34} } (We put the value of e = 1.6 × {10}^{ - 19}) \\ → 8 × {10}^{14}$

Required answer = Option A