Question

Choose the correct statement based on the penetrating power.

• A. $\beta rays$ > $\alpha rays$ > $\gamma rays$
• B. $\beta rays$ < $\alpha rays$ < $\gamma rays$
• C. $\alpha rays$ < $\beta rays$ < $\gamma rays$
• D. $\alpha rays$ > $\beta rays$ > $\gamma rays$

Answer 1

The correct option is C

$\alpha rays$ < $\beta rays$ < $\gamma rays$

$\alpha$-rays have the least penetrating power, it can penetrate a 0.01 mm thick $Al$ foil.

$\beta$-rays have more penetrating power than $\alpha$-rays, it can penetrate a 0.2 mm $Al$ foil.

$\gamma$-rays have the highest penetrating power, it can penetrate 1000 mm $Al$ sheet.