Elementary Modern Physics - Jamb Physics Past Questions and Answers

Question 81:

• JAMB 2002

The percentage of the original nuclei of the sample of a radioactive substance left after 5 half - lives is

A. 8%
B. 5%
C. 3%
D. 1%

Question 82:

• JAMB 2002

The particle that is responsible for the nuclear fission in a nuclear reactor is

A. Neutron
B. Prton
C. Electron
D. Photon

Question 83:

• JAMB 2003

The count rate of a radioactive material is 800 count/min. If the half-life of the material is 4 days, what would the count rate be in 16 days later

A. 200 count / min
B. 100 count / min
C. 50 count / min
D. 25 count / min

Question 84:

• JAMB 2003

The maximum kinetic energy of the photoelectron emitted from a metal surface is 0.34eV. If the work function of the metal surface is 1.83eV,find the stopping potential.

A. 2.17V
B. 1.49V
C. 1.09V
D. 0.34V

Question 85:

• JAMB 2003

When a nucleus is formed by bringing protons and neutrons together, the actual mass of the formed nucleus is less than the sum of the masses of the energy equivalent of this mass difference is the

A. Lost energy
B. Work function
C. Binding energy
D. Stability energy