The threshold frequency for a photo-sensitive metal is 3.3 × 1 0 14 Hz . If light of frequency 8.2 × 1 0 14 Hz is incident on this metal, the cut-off voltage for the photo-electric emission is nearlyN

Question

The threshold frequency for a photo-sensitive metal is 3.3 × 1 0 14 Hz . If light of frequency 8.2 × 1 0 14 Hz is incident on this metal, the cut-off voltage for the photo-electric emission is nearlyNEET 2011 (Mains)

TestHub · Accepted Answer

V 0 ​ ​ = e E − V ​ = e h ( v − v 0 ​ ) ​ = 1.6 × 1 0 − 19 6.62 × 1 0 − 34 ( 8.2 × 1 0 14 − 3.3 × 1 0 14 ) ​ = 1.6 6.62 × 1 0 − 34 ​ × 4.9 × 1 0 33 = 1.6 6.62 × 4.9 × 1 0 − 1 ​ ​ V 0 ​ = 2 volt

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