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Question

In a photoelectric experiment for 4000A
incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000A
, then the potential required to stop the ejection of electrons will be


A

2 V

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B

Less than 2 V

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C

Zero

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D

Greater than 2 V

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Solution

The correct option is D

Greater than 2 V


According to Einstein's photoelectric equation
E=W0+KmaxV0=hce[1λ1λ0]
Hence if λ decreases V0 increases


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