Bohr’s Theory and Electron Mass – Rankers Physics
Topic: Modern Physics
Subtopic: Atomic Structure

Bohr’s Theory and Electron Mass

Assertion (A): In H-atom, according to Bohr's theory, electron revolves around the nucleus in orbits in which the angular momentum of electron is as integral multiple of \(h/(2\pi)\).
Reason (R): Mass of electron is equal to the mass of proton.
 
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Solution:

Bohr's theory states angular momentum \(L = n h / (2\pi)\). So (A) is true. Mass of electron (\(9.109 \times 10^{-31}\text{ kg}\)) is not equal to mass of proton (\(1.672 \times 10^{-27}\text{ kg}\)). So (R) is false. Hence, (A) is true but (R) is false.

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