Solved problem

Nuclear Physics (Science)

Solved problem 6.1

Identify A, B, C, and D from the following nuclear reactions.

Solution:

A is alpha particle, B is neutron, C is proton, and D is electron.

Solved problem 6.2

A radon specimen emits radiation of 3.7 × 103 GBq per second. Convert this disintegration in terms of curie. (one curie = 3.7 × 1010 disintegration per second)

1 Bq = one disintegration per second one curie = 3.7 × 1010 Bq

Solved problem 6.3

 92 U 235 experiences one α - decay and one β - decay. Find number of neutrons in the final daughter nucleus that is formed.

Solution:

Let X and Y be the resulting nucleus after the emission of the alpha and beta particles respectively.

Number of neutrons = Mass number – Atomic number = 231 – 91 = 140

Solved problem 6.4

Calculate the amount of energy released when a radioactive substance undergoes fusion and results in a mass defect of 2 kg.

Solution:

Mass defect in the reaction (m) = 2 kg

Velocity of light (c) = 3 × 108 m s-1

By Einstein’s equation,

Energy released E = mc2

So E = 2 × (3 × 108)2

= 1.8 × 1017 J