Question

Which is the best description of an alpha particle?

• A. Charge $+2$; mass of $4\, amu$; high penetrating power
• B. Charge $+2$;mass of $4\, amu$;low penetrating power
• C. Charge $-1$; mass of $0\, amu$;medium penetrating power
• D. Charge 0 ; mass of $0 \, amu$,no penetrating power

Answer 1

Answer: (B)

$\left({ }_2 He ^4\right)^{2+}$
$\alpha-$ particles have low penetrating power. It is positively $(+2)$ charged helium nucleus