GENERAL KNOWLEDGE

Detailed explanation-1: -Gamma rays can be emitted from the nucleus of an atom during radioactive decay. They are able to travel tens of yards or more in air and can easily penetrate the human body. Shielding this very penetrating type of ionizing radiation requires thick, dense material such as several inches of lead or concrete.

Detailed explanation-2: -The great penetrating power of gamma rays stems from the fact that they have no electric charge and thus do not interact with matter as strongly as do charged particles. Because of their penetrating power gamma rays can be used for radiographing holes and defects in metal castings and other structural parts.

Detailed explanation-3: -Gamma rays are the most harmful external hazard. Beta particles can partially penetrate skin, causing “beta burns”. Alpha particles cannot penetrate intact skin. Gamma and x-rays can pass through a person damaging cells in their path.

Detailed explanation-4: -Gamma rays have the shortest wavelengths of all electromagnetic radiation, has the greatest penetrating power.

Detailed explanation-5: -When the wavelength is shorter the penetrating power is more. -rays have the shortest wavelength among the given options. So, -rays have the highest penetrating power.