Question

a mass of lead is enabled in block of aluminium 2 mm thick. It is placed in the path of radioactive emission and on the opposite side of the cube is placed a fluroscent screen . It is shown that the shadow formed by aluminium is higher than that formed by lead . State the reason

Answer 1

the shadow of the al box is more fainter coz  al is more transparent towards radioactive radiations compared with pb 
thus some radiatians pass through al and produce a fainter shadow on the screen and very less radiations pass through pd and hence a distinct shadow is there

Answer 2

Answer:

Here is your answer.

See the attachment.