Question

The nuclide $X$ undergoes $\alpha$-decay and another nuclide $Y$, ${\beta }^{-}$-decay. Which of the following statements are correct?
1. The ${\beta }^{}$-particles emitted by $Y$ may have widely different speeds.
2. The $\alpha$-particles emitted by $X$ may have widely different speeds.
3. The $\alpha$-particles emitted by $X$ will have almost same speed.
4. The $\beta$-particles emitted by $Y$ will have the same speed.

• A. 1 and 3 are correct
• B. 2 and 3 are correct
• C. 3 and 4 are correct
• D. 1 and 4 are correct

Answer 1

The correct option is A 1 and 3 are correct

Speed order $\alpha >\beta >\gamma$

Penetration order $\gamma >\beta >\alpha$

Ionisation energy $\alpha >\beta >\gamma$