If the kinetic energy of the particle is increased to 16 times its previous value, the percentage
change in the de-Broglie wavelength of the particle is :

Fusion reaction takes place at high temperature because :

A radio isotope ‘X’ with a half life \[1.4\times 10^{9} years\] decays to ‘Y’ which is stable. A sample of the rock from a cave was found to contain ‘X’ and ‘Y’ in the ratio 1 : 7. The age of the rock is :

A common example of β-decay is

\[_{15}P^{32}\longrightarrow _{16}P^{32} + x + y\]

Then x and y stand for :

In radioactive decay process, the negatively charged emitted β – particles are :

Half life of a radio-active substance is 20 minutes. The time between 20% and 80% decay will be :

Initial number of nuclei of a radioactive substance is \[5\times 10^{16}\] and half life is 10 yrs. Find number of nuclei decayed in 5 yrs.

The above is a plot of binding energy per nucleon Eb, against the nuclear mass M; A, B, C, D, E, F correspond to different nuclei. Consider four reactions :

(i) A + B → C + ε

(ii) C → A + B + ε

(iii) D + E → F + ε

(iv) F → D + E + ε

where ε is the energy released ? In which reactions in ε positive :

If the binding energy per nucleon of deuteron is 1.115 MeV, its mass defect in atomic mass unit is :

200 MeV of energy can be obtained by per fission. In a reactor generating 1000 kW find the number of nuclei under going the fission per second :