Question

A mixture of radioactive substances gives off three types of radiations. Name the radiation which travels with the speed of light.

Answer 1

Radioactivity :-

1. Any radioactive substance emits $\mathrm{\alpha },\mathrm{\beta }\mathrm{and}\mathrm{\gamma }$ particles form an unstable nucleus is called radioactivity.
2. A radioactive substance gives of three types of radiation like $\mathrm{\alpha },\mathrm{\beta }\mathrm{and}\mathrm{\gamma }$ radiation.
3. Out of the $\mathrm{\alpha },\mathrm{\beta }\mathrm{and}\mathrm{\gamma }$ radiation $\gamma$ radiation travel with speed of light.

Hence, $\mathrm{\gamma }$ radiation travel with speed of light.