The work function for metals A , B and C...

The work function for metals `A , B` and `C` are respectively `1.92 eV , 2.0 eV` and `5 eV`. According to Einstein's equation , the metals which will emit photoelectrons for a radiation of wavelength `4100 Å` are

None

A only

A and B only

All the three metals

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The correct Answer is:

Energy of photon `=(12400)/(4100)~~3ev`

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