The attenuation coefficient of bone is 600 m-1 for x-rays of energy 20 keV and the intensity of beam of x-rays is 20 Wm-2 then the intensity of beam after passing through a bone of 4mm is

The attenuation coefficient of bone is 600 m-1 for x-rays of energy 20

1.	The attenuation coefficient of bone is 600 m-1 for x-rays of energy 20 keV and the intensity of beam of x-rays is 20 Wm-2 then the intensity of beam after passing through a bone of 4mm is
A.	2.5 Wm-2
B.	3 Wm-2
C.	1.8 Wm-2
D.	2.0 Wm-2
Answer» D. 2.0 Wm-2