In case of photo conductor for germanium when forbidden energy gap is 0.72 eV, the critical wavelength for intrinsic excitation will be

In case of photo conductor for germanium when forbidden energy gap is

1.	In case of photo conductor for germanium when forbidden energy gap is 0.72 eV, the critical wavelength for intrinsic excitation will be
A.	1.43 m
B.	1.43 mm
C.	1.73 mm
D.	1.73 x 10¹² m
Answer» D. 1.73 x 10¹² m