Question

The intensity of X-rays of wavelength 0.5 Angstrom reduces to one fourth on passing through 3.5 mm thickness of a metal foil. The coefficient of absorption of metal will be- (1) 0.2 mm^-1 (2) 0.3 mm^-1 (3) 0.4 mm^-1 (4) 0.5 mm^-1

Answer 1