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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 of wavelength 4100\AA  is/are -

Option: 1

None


Option: 2

A only


Option: 3

A and B only


Option: 4

All the three metals


Answers (1)

best_answer

E=\frac{h c}{\lambda}=\frac{12400}{4100} e V=3.03 \mathrm{eV}
Photoelectrons will be emitted for E> \phi , \ i.e. from A and B only.

Posted by

avinash.dongre

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