Elementary Modern Physics - Jamb Physics Past Questions and Answers

Question 101:

• JAMB 2006

One of the properties of gamma rays is that they are?

A. Neutral
B. Massive
C. Positively charged
D. Negatively charged

Question 102:

• JAMB 2006

A radioactive element has a half life of 4 days. The fraction that has decayed in 16 days is?

A. (15)/16
B. (1)/16
C. (3)/4
D. (1)/4

Question 103:

• JAMB 2006

I. The number of neutrons released exceeds the number that caused the fission.
II. There is loss of mass.
III. Energy is produced.
IV. Smaller nuclei merge to form larger nuclei
which of the statement above are correct about nuclear fission?

A. II,III and IV only
B. I, II and IV only
C. I,II and III only
D. I, III and IV only

Question 104:

• JAMB 2006

A radioactive substance has a half-life of 20 days what fraction the original radiation nuclei will remain after 80 days?

A. (1)/32
B. (1)/16
C. (1)/ 8
D. (1)/4

Question 105:

• JAMB 2007

The energy E of a photon and it's wavelength are related by Eλ = X. the numerical value of X is?
[h = 6.63 x 10^-34js, c = 3 x 10⁸ ms^-1]

A. 6.6 X 10^-28
B. 1.99 X 10^-27
C. 6.60 x 10^-26
D. 1.99 x 10^-25