Among the three kinds of nuclear radiations, _________ rays are most harmful, since they have the greatest penetrating power.

gamma

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beta

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alpha

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infrared

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Solution

The correct option is A gamma
Rutherford studied the radiations coming out from the nucleus of radioactive elements. He found that these substances emit three kinds of radiations namely, alpha, beta and gamma. Among the three, gamma radiations have the highest penetrating power. They can penetrate a 25 mm thick aluminium plate.

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