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A metal surfacc is irradiated with radiation of frequency 3.0 x 10“Hz. If the stopping potenlial is 0.ScV, the
minimum frequency necded to eject an clectron from that metal surface will be.
A
E
3x 10" Hz
0.8 x 10" Hz
2.0 x 10
1.1 x 10" Hz
1.6 x 10" Hz

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