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Q.

In a photoelectric experiment, when energy of photon of incident radiation is 6.5 eV, the stopping potential is found to be 3 V. In the same experimental set up, what will be the wave length of incident radiation, if the stopping potential is 2 V ?

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a

2258 Ao

b

3428 Ao

c

3642 Ao

d

5240 Ao

answer is A.

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Detailed Solution

Work function of target metal =6.5-3=3.5 eVWhen stopping potential is 2 volt, energy of each photon of incident radiation 3.5+2=5.5 eVWave length of incident radiation =124205.5 Ao=2258 Ao
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