Question

Assertion :$\alpha$-rays have greater ionising power than $\beta$. Reason: $\alpha$-particles carry $2^{+}$ charge while $\beta$-particles carry only $1^{-}$ charge.

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

$\bullet$Order of ionising power

$\alpha >\beta >\gamma$

$\bullet$$\alpha$-particles carry +2 charge

$\bullet$$\beta$-particles carry -1 charge.

$\Rightarrow$Both Assertion and Reason are correct but reason is not the correct explanation for Assertion.