A p-type semiconductor has accepter levels 60 meV above the valence band. What will be the maximum wavelength of em wave which can create a hole? (Plank's constant = 4.14 × 10-15 eV-s, Speed of light in vacuum = 3 × 108 ms-1)
1
20.7 μm
2
30.8 μm
3
40.9 μm
4
50.0 μm