The `gamma` radiations are

The particles of gamma radiation are

How are gamma radiations produced ? Mention two common properties of the gamma radiations and visible light.

Why do we usually use isotopes emitting gamma radiations as radioactive tracers in medical science ? [Hint : gamma radiations are most penetrating]

In a cloud chamber alpha , beta and gamma -radiations are sent. The nature of tracks produced by these particles respectively will be

In gamma radiation, charge of each gamma particle is..........

What is the value of the speed of gamma radiations in air or vacuum ?

alpha, beta and gamma radiations have the same velocity as light.