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1516
When an atom loses or gains a charge, it becomes
  • A. an electron
  • B. an ion
  • C. a neutron
  • D. a proton
View Answer & Discuss (2) JAMB 1991
1517

4g of a radioactive material of half-life 10 days is spilled on a laboratory floor. How long would it take to disintegrate 3.5g of the material?

  • A. 1\(\frac{1}{4}\) days
  • B. 8\(\frac{1}{4}\) days
  • C. 30 days
  • D. 80 days
View Answer & Discuss (7) JAMB 1991
1518

In a nuclear fusion process, four protons each of mass Mp were fused to produce a nucleus X of mass Mx. Which of the following equations is CORRECT?

  • A. 4Mp > Mx
  • B. 4Mp = Mx
  • C. 4Mp < Mx
  • D. Mp > Mx
View Answer & Discuss (3) JAMB 1991
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1519
Which of the following are True for \(\alpha\)-decay. i. mass number, decrease by four. ii. Atomic number decreases by two. iii. mass number does not change.
  • A. i and ii only
  • B. ii and iii only
  • C. i and iii only
  • D. i, ii, and iii only
View Answer & Discuss (3) JAMB 1991
1520
Which of the following phenomena is called photoelectric effect?
  • A. high energy electrons impinge on a metalic anode which then emits photons
  • B. a high energy photon emits photons as it slowed down
  • C. a metal absorbs quanta of light and then emits electrons
  • D. Two electrons are created from a quantum of light
View Answer & Discuss JAMB 1991
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