question_answer

Thickness of the medium \[(\mu )\] at which intensity of emergent x-rays becomes half is:

A) \[\frac{1.23}{\mu }\]

B) \[\frac{3.318}{\mu }\]

C) \[\frac{0.126}{\mu }\]

D) \[\frac{0.693}{\mu }\,\]