question_answer

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 photo, electrons for a radiation of wavelength \[4100\text{ }\overset{\text{o}}{\mathop{\text{A}}}\,\] is/are

A)  none

B)  A only

C)  A and B only

D)  All the three metals