JEE Main · 2006 · 30 Apr 2006 · Offline · Modern Physics

The time by a photoelectron to come out after the photon strikes is approximately

(A) $1 0^{- 1} s$
(B) $1 0^{- 4} s$
(C) $1 0^{- 10} s$ ✓ Correct
(D) $1 0^{- 16} s$

Answer: (C)

Solution

Photoemission is essentially instantaneous: once a photon of sufficient energy strikes the surface, an electron absorbs it and escapes with no measurable delay, in a time of order

1 0^{- 9}

1 0^{- 10} s

. Among the choices the appropriate estimate is about

1 0^{- 10} s

JEE Main · 2006 · 30 Apr 2006 · Offline · Single correct option

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