Assertion: Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate.
Reason: According to classical physical all moving electrons radiate.

Options

A. if both assertion and reason are true and reason is the correct explanation of assertion.
B. if both assertion and reason are true but reason is not the correct explanation of assertion.
C. if assertion is true but reason is false.
D. if both assertion and reason are false.

Answer

C

Explanation

bohr postulated that electron instead of revolving in any around the nucleus, revolve only in some specific orbits. These irbits are called the non-radiating orbits or the stationary orbits. The electrons revolving in these orbits do not radiate any energy. they radiate only when they go from one orbit to the next lower orbit.