Elementary Modern Physics - Jamb Physics Past Questions and Answers

Question 91:

• JAMB 2004

The binding energy of helium He is

4

2

[atomic mass of proton = 1.00783U,
atomic mass of neutron = 1.00867U]

A. 4.033U
B. 2.017U
C. 0.033U
D. 0.330U

Question 92:

• JAMB 2004

The difference between X-rays and gamma rays is that

A. X-rays are more penetrating than gamma rays
B. X-rays are electromagnetic radiations while gamma rays are negatively charged radiation
C. X-rays have higher frequencies than gamma rays
D. X-rays arise from energy changes in the electronic structure of atoms while gamma rays come from the nucleus

Question 93:

• JAMB 2005

the time it will take a certain radioactive material with a half-life of 50 days to reduce to 1/32of its original number is

A. 250days
B. 150days
C. 300days
D. 200days

Question 94:

• JAMB 2005

The charge carriers in gasses are

A. Ions only
B. Electrons and ions
C. Electrons and holes
D. Electrons only

Question 95:

• JAMB 2005

the ray which causes gas molecules to glow is known as

A. Cathode ray
B. Anode ray
C. Molecular ray
D. Gamma ray