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The threshold frequency for a certain me...

The threshold frequency for a certain method is` 3.3 xx 10^14 Hz`. If light of frequency `8.2 xx 10^14 Hz` is incident on the metal predict the cut-of voltage for the photoelectric emission.

A

4.9 V

B

3.0 V

C

2.0 V

D

1.0 V

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The correct Answer is:
C
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