NEET Physics Question - Modern Physics

Assertion (A): Rydberg constant varies with mass number of a given element.

Reason (R): The reduced mass of electron depends on the mass of the nucleus.

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:

The effective Rydberg constant for an atom depends on the reduced mass \( \mu = \frac{m_e M}{m_e + M} \), where \( M \) is the nuclear mass (related to mass number). So, (A) is true. The reduced mass clearly depends on the nuclear mass. So (R) is true. (R) correctly explains (A).

Rankers Physics

Rydberg Constant Dependence on Mass Number

Solution:

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