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Q.

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

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a

2 V

b

Less than 2 V.

c

Zero

d

Greater than 2 V.

answer is D.

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Detailed Solution

According to Einstein's photoelectric equationV0=hce1λ-1λ0Hence if λ decreases V0 increases
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In a photoelectric experiment for 4000 A° incident radiation, the potential difference to stop the ejection is 2 V. If the incident light is changed to 3000 A, then the potential required to stop the ejection of electron will be: