What is the velocity of `gamma` radiations?

What are gamma radiations

The gamma radiations are

Assertion(A): The energy of ultraviolet radiation is greater than the energy of infrared radiation Reason (R): The velocity of ultraviolet radition is greater than the velocity of infrared radiation.

Assertion (A) : The energy of ultraviolet radiation is greater than the energy of infrared radiation Reason (R) : The velocity of ultraviolet radiation is greater than the velocity of infrared radiation

Describe in brief the process of gamma radiation.

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