Question 471:

• JAMB 1987

A galvanometer of resistance 20\(\Omega\) is to be provided with a shunt that \(\frac{1}{10}\) of the whole current in a circuit passes through the galvanometer. The resistance of the shunt is

A. 2.00\(\Omega\)
B. 2.22\(\Omega\)
C. 18.00\(\Omega\)
D. 18.22\(\Omega\)

Question 472:

• 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

Question 473:

• JAMB 1987

Which of the following statements is TRUE of photoelectric effect?

A. It cannot occur in liquids
B. The energy of the emitted electrons is independent of the work function of the surface
C. The energy of the emitted electron depends on the wavelength of the incident light
D. The greater the intensity of the incuident light, the greater the incident of the emitted electron

Question 474:

• JAMB 1987

Isotopes are nuclei which have

A. The same number of nuetrons and electrons
B. Equal number of electrons and protons
C. The same atomic number but different number of neutrons
D. The same number of total particles

Question 475:

• JAMB 1987

A radioactive sample initially contains N atoms. After three half-lives the number of atoms that have disintegrated is

A. \(\frac{N}{8}\)
B. \(\frac{3N}{8}\)
C. \(\frac{5N}{8}\)
D. \(\frac{7N}{8}\)