Elementary Modern Physics - Jamb Physics Past Questions and Answers

Question 61:

• JAMB 1998

In a nuclear fusion experiment, the loss of mass amounts to 1.0 x 10^-6kg. The amount of energy obtained from the fusion is

A. 3.0 x 10^-4J
B. 3.0 x 10^-1J
C. 9.0 x 10⁴J
D. 9.0 x 10¹⁰J

Question 62:

• JAMB 1998

In photoelectric effect, electrons will leave the metal surface when illuminated by light of appropriate frequency if the photon energy is

A. Greater than the work function
B. Less than the work function
C. Equal to the work function
D. Equal to the maximium kinetic energy of the electron

Question 63:

• JAMB 1999

Gamma rays are produced when

A. High velocity electrons are abruptly stopped in metals
B. Energy changes occur within the nucleus of atoms
C. Energy changes occur within the electronic structure of atoms
D. Electrons are deflected in very strong magnetic fields

Question 64:

• JAMB 1999

What is the speed of a particle of mass 10^-27kg whose wavelength is 10^-8m.
[h = 6.63 x 10^-34Js]

A. 6.63ms^-1
B. 66.30ms^-1
C. 663.00ms^-1
D. 6630.00ms^-1

Question 65:

• JAMB 1999

In the Rutherford scattering experiment, a beam of alpha particles was fired at a thin gold film with some of the particles being considerably deflected. This shows that

A. A gold nucleus contains protons, neutrons and electrons uniformly distributed in a tiny volume
B. The gold nucleus is positively charged and is concentrated in a tiny volume
C. The gold nucleus emitted alpha particles
D. The gold nucleus is concentrated in a tiny volume and contains alpha particles