Question
Consider $$\alpha $$ particles, $$\beta $$ particles and $$\gamma $$ - rays, each having an energy of $$0.5\,MeV.$$ In increasing order of penetrating powers, the radiations are:
A.
$$\alpha ,\beta ,\gamma $$
B.
$$\alpha ,\gamma ,\beta $$
C.
$$\beta ,\gamma ,\alpha $$
D.
$$\gamma ,\beta ,\alpha $$
Answer :
$$\alpha ,\beta ,\gamma $$
Solution :
Note : The penetrating power is dependent on velocity. For a given energy, the velocity of $$\gamma $$ radiation is highest and $$\alpha $$-particle is least.