Question

Assertion :Bragg's equation has no solution, if $n=2$ and $\lambda >d$ Reason: Bragg's equation is $n\lambda =2d\sin \theta$

• 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

As we know, Bragg's equation is given as follows:

$n\lambda =2d\sin \theta$

If $n=2$ and $\lambda >d$, then according to equation,

$\sin \theta >1$, which is not possible as $-1<\sin \theta <1$

Hence, both assertion and reason are correct and the reason is the correct explanation for the assertion.

Hence, the correct option is $\text{A}$