Elementary Modern Physics - Jamb Physics Past Questions and Answers

Question 96:

• 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

Question 97:

• JAMB 2005

Satellite communication network makes use of?

A. Visible light
B. Sound wave
C. Radio wave
D. Infra-red wave

Question 98:

• JAMB 2005

\( ^{235} _{92}U + ^1 _0n → ^{144} _{56}Ba + ^{90} _{36}Kr +2X \)
In the reaction above, X is

A. Electron
B. Proton
C. Neutrino
D. Neutron

Question 99:

• JAMB 2006

The energy associated with the emitted photon when a mercury atom changes from one state to another is 3.3 ev. calculate the frequency of the photon.
[e = 1.6 x 10^-19c; h = 6.6 x 10^-13js]

A. 1.3 x 10^-15 Hz
B. 3.1 x 10⁵² Hz
C. 3.2 x 10^-53 Hz
D. 8.0 x 10¹⁴ Hz

Question 100:

• JAMB 2006

The process through which free electrons leave the surface of hot metal is known as?

A. Photon emission
B. Photo emission
C. Thermionic emission
D. Electron emission