Physics - Study Mode

[#1231] Which, of the following radiations has the least wavelength ?
Correct Answer

(C) G-rays

Explanation

Solution: X-rays – smaller than 10 nano metre. Gamma- rays – 0.0005 to 0.1 nano metre. Alpha-rays – 125 nano metre.

[#1232] For Gamma radiation, what stops its penetrating abilities?
Correct Answer

(D) All of the above

Explanation

Solution: It is a result of unstable atoms that are trying to stabilize. The excess energy is released as gamma particles. However, lead, steel and concrete reduce the energy of these particles and hence stop their penetrating abilities.

[#1233] An atom bomb based upon the principle of ________
Correct Answer

(A) Nuclear fission

Explanation

Solution: The atom bomb is based on the principle of nuclear fission.

[#1234] The damage of the human body due to radiation (X-rays or gamma rays etc) is measured in :
Correct Answer

(A) Rems

Explanation

Solution: The damage of the human body due to radiation (X-rays or gamma rays etc) is measured in rems.

[#1235] Radioactivity is due to
Correct Answer

(A) Unstable nucleus

Explanation

Solution: Radioactivity is the release of energy and matter due to a change in the nucleus of an atom. Radioisotopes are isotopes that are unstable and release radiation. All isotopes are not radioisotopes. Transmutation occurs when a radioactive element attempts to become stabilized and transforms into a new element.