Physics - Modern Physics Question with Solution | TestHub
PhysicsModern PhysicsPhotoelectric effectEasy2 minPYQ_2022
PhysicsEasysingle choice
When a certain metal surface is illuminated with light of frequency , the stopping potential for the photoelectric current is . When the same surface is illuminated by a light of frequency , the stopping potential is . The threshold frequency of photoelectric emission is
Options:
Answer:
C
Solution:
Stopping potential is the energy required to stop the moving electrons after photoelectric emission. Hence it must be equal to the maximum kinetic energy of the emitted electron.
Incident energy Threshold energy + Kinetic energy
Given:
Multiply equation (2) by 4 and substract equation (1) from it to obtain:
Stream:MHT_CETSubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect
⏱ 2mℹ️ Source: PYQ_2022
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