A metal surface is illuminated by light ...

A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoelectrons corresponding to these wavelengths are `mu_1` and `mu_2` respectively. If the ratio `u_1: u_2 = 2:1 and hc= 1240 eV` , the work function of the metal is nearly.

3.7 eV

3.2 eV

2.8 eV

2.5 eV

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