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Physics 2013 WAEC Past Questions

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36
A coil of inductance 0.12 H and resistance 4\(\Omega\), is connected across a 240V, 50Hz supply. Calculate the current through it. [\(\pi\) = 3.142]
  • A. 6.3A
  • B. 33.3A
  • C. 37.2A
  • D. 40.0A
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37
The work function of a metal is 2.56 x 10-19J. Calculate the frequency of a photon whose energy is required to eject from the metal an electron with kinetic energy of 3.0ev. [1 eV = 1.6 x 10-19J, h = 6.6 x 10-34Js]
  • A. 5.56 x 1019Hz
  • B. 1.66 x 1019Hz
  • C. 1.12 x 1015Hz
  • D. 8.42 x 1014Hz
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38
The minimum energy required to cause photoelectric emission when the surface of a metal is irradiated with electromagnetic radiation of suitable frequency is called
  • A. critical energy
  • B. ionization energy
  • C. work function
  • D. planck's constant
View Answer & Discuss (6) WAEC 2013
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39
Which of the following particles are termed nucleons in a neutral atom?
  • A. protons and neutrons
  • B. neutrons and electrons
  • C. protons and electrons
  • D. protons, electrons and neutrons
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40
Which of the following statements about the use of radioisotopes is not correct? They are used to
  • A. induce mutations in plants and animals to obtain new and improved varieties
  • B. trace the paths of metabolic processes in plants and animals
  • C. estmate the age of rocks
  • D. locate broken bones
View Answer & Discuss (6) WAEC 2013
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