Question

Assertion :In Lyman series, the ratio of minimum and maximum wavelength is $\frac{3}{4}$. Reason: Lyman series constitute spectral lines corresponding to transition from higher energy to ground state of hydrogen atom.

• 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. Assertion is incorrect but Reason is correct

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

$\frac{1}{\lambda }=R(\frac{1}{n_1^2}-\frac{1}{n_2^2})$

Lymen series: $n_1=1$
Shortest wavelength, $n_2=\infty$
$\frac{1}{\lambda }=R\left(\frac{1}{1^2}\right)=R$

Largest wavelength: $n_2=2$
$\frac{1}{\lambda }=R(\frac{1}{1^2}-\frac{1}{2^2})=\frac{3R}{4}$

Ratio $=\frac{3}{4}$