Assertion (A): Rydberg constant varies with the mass number of a given element.  Reason(R):  Reduced mass of the electron depends on the mass of the nucleus only.

Both A and R are correct and R is a correct explanation of A Both A and R are correct and R is NOT a correct explanation of A A is true but R is false Both A and R are false

Both A and R are false

Rydberg constant is independent of mass number of the element. Reduced mass of the system depends on the masses of both the electron and the nucleus.