JEE Main & Advanced
Physics
Photo Electric Effect, X- Rays & Matter Waves
JEE PYQ-Photo Electric Effect X-rays
question_answer
The anode voltage of a photocell is kept fixed. The wavelength λ of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows: [JEE MAIN 2013]
A)
B)
C)
D)
Correct Answer:
D
Solution :
[d] Aswill increase will decrease so current should decrease and finally fall to zero whenis achieved.