X-rays; radioactive fallout from nuclear plants and other sources.
An electromagnetic radiation is used for photography in fog. 
(i) Identify the radiation.
(ii) Why is this radiation mentioned by you, ideal for this purpose ?
In following Figure shows a radioactive source S in a thick lead walled container having a narrow opening. The radiations pass through an electric field between the plates A and B.
(a) Complete the diagram to show the paths of α , β and γ radiations.
(b) Why is the source S kept in a thick lead walled container with a narrow opening?
(c) Name the radiation which is unaffected by the electrostatic field.
(d) Which radiation is defleced the most. Given reason.
(e) Which among the three radiations causes the least biological damage?
How γ - radiations are produced? Mention two common properties of gamma radiations and visible light.