Concepts Of Physics MCQ Edition [Volume 2]PhysicsPhotoelectric Effect and Wave–Particle Duality

A metal has a work function of 2.5 10⁻¹⁹ J . Determine the threshold frequency for photoelectric emission.

Options

A2.5 10¹⁴ Hz
B5.2 10¹⁴ Hz
C3.8 10¹⁴ Hz
D1.9 10¹⁴ Hz

Correct answer

C. 3.8 10¹⁴ Hz

Step-by-step solution

The work function of a metal is related to its threshold frequency by the equation = h ₀ , where h is Planck's constant and ₀ is the threshold frequency. Substituting the given values: ₀ = h ₀ = 2.5 10⁻¹⁹ 6.63 10⁻³⁴ ₀ 3.77 10¹⁴ Hz Rounding to one decimal place, ₀ 3.8 10¹⁴ Hz

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