Read the passage below about different types of radiation.

Different types of radiation have different penetrating abilities. For example, gamma rays can pass through cloth and paper, but alpha particles are blocked by cloth and paper. Beta particles are blocked by aluminum foil, but gamma rays are not. However, all three types of radiation are blocked by thick concrete or lead.

Now, examine a table of penetrating powers of different types of radiation.

Material123LeadStoppedStoppedStoppedClothNot stoppedStoppedStoppedAluminum foilNot stoppedStoppedStoppedWoodNot stoppedStoppedStoppedPaperNot stopped StoppedNot stoppedThick concreteStoppedStoppedStopped
Based on the information, at which numbered spot in the table does each type of radiation belong?

1 = beta; 2 = alpha, 3 = gamma

1 = alpha; 2 = beta, 3 = gamma

1 = beta; 2 = gamma, 3 = alpha

1 = gamma; 2 = alpha, 3 = beta

Explanation : In the given passage it is seen that the all the radiations are stopped by the lead block. So assuming that first radiation is the gamma radiation which was not stopped by the cloth and rest others were stopped. Aluminum foil and wood were able to block alpha and beta radiations. Paper stopped the alpha particles but not the gamma and beta rays. And thick concrete stopped all the radiations.

So, it confirms that the first radiation is of gamma rays, second is alpha rays and third is beta rays.