Elementary Modern Physics - Jamb Physics Past Questions and Answers

Question 51:

• JAMB 1993

Which of the following are produced after a nuclear fusion process? i. one heavy nucleus. ii. neutrons^-1. iii. protons. iv. Energy.

A. I and ii
B. I and iv
C. Ii and iii
D. Ii and iv

Question 52:

• JAMB 1993

An element X of an atomic number 88 and mass number 226 decays to form an element Z by emitting two beta particles and an alpha particle. Z is represented by

A. \(^{222}_{82}Z\)
B. \(^{222}_{88}Z\)
C. \(^{226}_{86}Z\)
D. \(^{226}_{80}Z\)

Question 53:

• JAMB 1993

The kinetic theory of photoelectron liberated from a metallic surface depends on the

A. Intensity of the incident radiation
B. Time duration of the incident radiation
C. Temperature of the incident radiation
D. Frequency of the incident radiation

Question 54:

• JAMB 1994

A certain radioisotope of \(^{235}_{92}U\) emits four alpha particles and three beta particles. The mass number and the atomic number of the resulting elements respectively are

A. 219 and 87
B. 84 and 223
C. 223 and 87
D. 219 and 81

Question 55:

• JAMB 1995

A light of energy 5eV falls on a metal and the electrons with a maximum kinetic energy of 2eV are ejected. The work function of the metal is

A. 0.4eV
B. 2.5eV
C. 3.0eV
D. 7.0eV