Question

Assertion: Balmer series lies in visible region of electromagnetic spectrum.
Reason: Balmer means visible, hence series lies in visible region.
A. If both, Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both, Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
C. If Assertion is true but the Reason is false.
D. If both Assertion and Reason are false.

Answer 1

Correct Answer - C
Assertion is true, but the reason is false. for Balmer series, `1/lambda=R[1/(2^(2))-1/(n^(2))]`,
where n=3,4,5......
When we put n=3,4,5....and `R=10^(-7)m^(-1)` in the given formula, the values of `lambda` calculated lie between 4000Å to 8000Å, which is visible region.