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QNEET-2016-Ph-1167: NEET 2016 Physics - Class 12 NEET-2016-Ph-1167 Solution: Photons with energy 5 eV are incident on a cathode C in a…
Photons with energy 5 eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C no photoelectrons will reach the anode A if the stopping potential of A relative to C is +3 V +4 V -1 V -3 V
Multiple Choice Options
- A + 3 V
- B +4 V
- C _ 1 V
- D _ 3 V
Step-by-Step Verified Solution
Stopping potential is the voltage which
is needed to stop energetic photo electron for
reaching towards cathode.
Stopping potential, _ = E � K max
2 eV = 5 eV � _ or _ = 3 eV
Now eV 0 = E' � _ = 6 eV � 3 eV = 3 eV
Hence stopping potential is �3V