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Physics Past Questions

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2241

In which of the following transitions is the largest quantum of energy liberated by an hydrogen atom when the electron changes energy levels? [n is the quantum number]

  • A. n = 2 to n = 1
  • B. n = 1 to n = 2
  • C. n = 2 to n = 3
  • D. n = 3 to n = 2
View Answer & Discuss (6) WAEC 2000
2242

Calculate the reactance of the inductor in the circuit diagram shown above [\(\pi = \frac{22}{7}\)]

  • A. 132\(\Omega\)
  • B. 214\(\Omega\)
  • C. 264\(\Omega\)
  • D. 269\(\Omega\)
View Answer & Discuss WAEC 2001
2243

A proton of wavelength \(\lambda_o\) is emitted when an electron in an atom makes a transition from a level of energy 2E. If the electron transits from \(\frac{4}{3}E_k\) to E level, determine the wavelength of the photon that would be emitted

  • A. 3\(\lambda_o\)
  • B. 2\(\lambda_o\)
  • C. \(\frac{3}{4}\)\(\lambda_o\)
  • D. \(\frac{1}{3}\)\(\lambda_o\)
View Answer & Discuss (8) WAEC 2000
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2244

Production of x-ray tube begins with

  • A. photo electric emission
  • B. collision of electrons
  • C. thermionic emission
  • D. field emission of electrons
View Answer & Discuss (4) WAEC 2001
2245

The nucleon number and the proton number of a neutral atom of an element are 23 and 11 respectively. How many neutrons are present in the atom?

  • A. 11
  • B. 12
  • C. 23
  • D. 34
View Answer & Discuss WAEC 2000
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