Question

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

$\frac{1}{\lambda }=R_H{Z}^2[\frac{1}{n_1^2}-\frac{1}{n_2^2}]$ --eq.1

For Lyman series,$n_1=1$. For the next level, $n_2=2$

so by eq.1 the ration of minimum and maximum wavelength is $\frac{3}{4}$

hence assertion is correct.

Yes, the Lyman series constitute spectral lines corresponding to the transition from higher energy to the ground state of the hydrogen atom. so the reason is also correct.

But the reason is not the correct explanation of the assertion. Hence option 'B' is correct.