Elementary Modern Physics - Jamb Physics Past Questions and Answers

Question 111:

• JAMB 2008

N + He → O + X

14	4	17
7	2	8

In the equation above, the particles X is

A. A proton
B. A neutron
C. An α - particle
D. A β - particle

Question 112:

• JAMB 2009

Cancerous cells can be destroyed by

A. Ultraviolet rays
B. Alpha particules
C. X - rays
D. Infrared rays

Question 113:

• JAMB 2009

If the decay constant of a radioactive substance is 0.231s¹, the half-life is?

A. 3.00 s
B. 0.12 s
C. 0.33 s
D. 1.50 s

Question 114:

• JAMB 2009

A piece of radioactive material contains 10²⁰ atoms.
If the half life of the material is 20 seconds, the number of disintegration in the first second is

A. 3.47 x 10¹⁸
B. 6.93 x 10 ²⁰
C. 3.47 x 10²⁰
D. 6.93 x 10¹⁸

Question 115:

• JAMB 2009

Thermionic emission is the process whereby

A. β - rays are produced
B. Holes are produced
C. X - rays are produced
D. Electrons leave a hot element