Question

Assertion :Limiting line in the Balmer series has a wavelength of $364.4mm$. Reason: Limiting line is obtained for a jump of electron from $n=\infty$.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

For limiting line of Balman series $\frac{1}{\lambda }=R(\frac{1}{{\left(2\right)}^2}=\frac{1}{{\left(\infty \right)}^2})=\frac{R}{4}$

$\therefore \lambda =364.4nm$. Thus assertion is true and reason is also correct and $n=\infty$ is used to calculate $\lambda$ hence reason also explains the assertion, i.e., option A.