Question

Assertion :The ratio of radius of first orbit to second orbit of hydrogen atom is 1 : 4. Reason: Radius for each circular orbit = $0.529n^2\mathring{A}$.

• 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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Radius of Bohr's circular orbit $=0.529n^2$

Radius of $1^{st}$ orbit = $0.529\times 1^2$

Radius of $2^{nd}$ orbit = $0.529\times 2^2$

Therefore ratio $=1:4$.

Hence, option $A$ is correct.