Photoelectric EffectMedium
Question
The thershold frequency for a photosensitive metal is 3.3 × 1014 . If light of frequency 8.2 × 1014 Hz is incident on this metal, the cut-off voltage for the photoelectron emission is nearly
Options
A.1 V
B.2 V
C.3 V
D.5 V
Solution
According to Eienstein′s photoelectric equation
where,
= Incident frequency
= Thershold frequency
V0 = Cuttoff or stopping potential
or, V0 =
Substituting the given value, we get
where,
= Incident frequency = Thershold frequencyV0 = Cuttoff or stopping potential
or, V0 =
Substituting the given value, we get
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