Light is incident on a metallic plate having work function 110 × 10⁻²⁰ J. If the produced photoelectrons have zero kinetic energy then the angular frequency of the incident light i $s _________$ rad/s. (h = 6.63 × 10⁻³⁴ J.s)
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Question

Light is incident on a metallic plate having work function 110 × 10⁻²⁰ J. If the produced photoelectrons have zero kinetic energy then the angular frequency of the incident light i $s _________$ rad/s. (h = 6.63 × 10⁻³⁴ J.s)

Options

G1 Physics · Accepted Answer

At threshold, the emitted photoelectrons have zero maximum kinetic energy. Therefore, hν = φ. Hence, ν = φ/h. Angular frequency is ω = 2πν = 2πφ/h. Substitute: φ = 110 × 10⁻²⁰ J, h = 6.63 × 10⁻³⁴ J·s. Thus, ω = [2π×110×10⁻²⁰]/[6.63×10⁻³⁴] ≈ 1.04 × 10¹⁶ rad/s. Correct option: A.

Light is incident on a metallic plate having work function 110 × 10⁻²⁰ J. If the produced photoelectrons have zero kinetic energy then the angular frequency of the incident light i s _________ rad/s. (h = 6.63 × 10⁻³⁴ J.s)