In the following questions, Statement of assertion (A) is followed by a statement of reason (R). 1. If both assertion and reason are true and the reason is the correct explanation of the assertion, then mark. 2. If both assertion and reason are true but the reason is not the correct explanation of the assertion, then mark. 3. If assertion is true statement but reason is false, then mark. 4. If both assertion and reason are false statements then mark.
Assertion: Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate. Reason: According to classical physics all moving electrons radiate.A) 1
B) 2
C) 3
D) 4
Correct Answer: B
Solution :
According to Bohrs postulate electrons can revolve only in those orbits in which their angular momentum is an integral multiple of \[\frac{h}{2\pi }\]. While revolving in stable orbits, electron do not radiate energy in spite of their acceleration towards the centre of the orbit. Hence, the atom remains stable. Classical physics state that all moving electrons radiate while Bohrs states that moving electrons radiate, only when they go from one orbit to the next lower orbit.
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