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Sunday, 16 August 2026
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Physics Past Questions and Answers

Topic: Elementary Modern Physics

Jamb Physics Questions - Elementary Modern Physics

Question 16:
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
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Question 17:
The threshold of frequency for photoelectric effect depends on the
  • A Intensity of incident light
  • B Frquency of incident light
  • C Material of the photocathode
  • D Potential difference between the cathode and the anode
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Question 18:
Natural radioactivity is the random spontaneous disintegration of the nuclei of heavy isotopes of certain elements with the emission of
  • A \(\alpha\), X, and \( \beta\)
  • B \(\alpha\), \(\beta\) and \(\gamma\)-rays
  • C X, \(\alpha\), \(\gamma\)-ray
  • D \(\alpha\), \( \beta\) and X-rays
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Question 19:
Which of the following are produced after a nuclear fusion process? i. one heavy nucleus. ii. neutrons-1. iii. protons. iv. Energy.
  • A I and ii
  • B I and iv
  • C Ii and iii
  • D Ii and iv
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Question 20:
An element X of an atomic number 88 and mass number 226 decays to form an element Z by emitting two beta particles and an alpha particle. Z is represented by
  • A \(^{222}_{82}Z\)
  • B \(^{222}_{88}Z\)
  • C \(^{226}_{86}Z\)
  • D \(^{226}_{80}Z\)
View Answer & Explanation