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The work functions 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 photo electrons for a radiation radiation of wavelength 4100 Å is/are
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- none
- A only
- A and B only
- all three metals
Correct Option: C
| E = | λ |
| ⇒ E = | eV | λ(in Å) |
| ⇒ E = | eV | 4100 |
⇒ E ≈ 3 eV
So, only metals having work function less than 3eV can emit photo electrons for the incident radiation of wavelength 4100 Å.
