Elementary Modern Physics - Jamb Physics Past Questions and Answers

Question 21:

• JAMB 1985

Which of the following features is NOT a characteristic of natural radioactivity?

A. Radioactivity is a nuclear phenomenon
B. Radioactivity is exhibited only by elements of mass number greater than 206
C. The radioactivity of an element is affected by electric and magnetic fields in the surroundings
D. Radioactive substances emits three types of radiations, a-rays, \(\beta\)-rays and y-rays
E. The radioactive element is transformed into a new element

Question 22:

• JAMB 1985

What is the number of neutrons in the Uranium isotope \(^{238}_{92}X\)?

A. 92
B. 146
C. 238
D. 330
E. 119

Question 23:

• JAMB 1986

In which of the following arrangements is the wavelength in an increasing order?

A. Gamma rays, infra-red rays, x-rays, radiowaves
B. Gamma rays, x-rays, infra-red ray, radiowaves
C. Radiowaves, x-rays, gamma ray, infra-red rays
D. Infra-red rays, radiowaves, x-rays, gamma rays

Question 24:

• JAMB 1986

The wavelength of ultraviolet radiation is 400nm. If the speed of light in air is 3 x 108ms-1, then the frequency of the ultraviolet radiation is

A. 1.3 x 10¹⁵Hz
B. 7.5 x 10⁵Hz
C. 1.2 x 10¹¹Hz
D. 7.5 x 10¹⁴Hz

Question 25:

• JAMB 1987

What type of reaction is represented by the following scheme? \( ^2 _1X \) + \( ^{2} _{1}Y \) + \( ^{3} _{2}Z \) + \( ^{1} _{0}n \) + energy

A. Fusion reaction
B. Fission reaction
C. Chain reaction
D. Radioactive decay