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4386

An electron of mass m and charge e moves in a circular path in a magnetic field of flux density B. How long does it take to complete one orbit? 

  • A. \(\frac{2me}{B\pi}\)
  • B. \(\frac{2B}{me\pi}\)
  • C. \(\frac{2\pi m}{Be}\)
  • D. \(\frac{Be}{2 \pi m}\)
View Answer & Discuss (5) WAEC 2020
4387

Which of the following statements about photoelectrons is correct?

  • A. A faint green light produces photoelectrons with less kinetic energy than a bright red light
  • B. A red light releases a smaller number of electrons than a green light
  • C. A faint green light produces photoelectrons with greater kinetic energy than a bright red light
  • D. A red light produces more photoelectrons than a green light
View Answer & Discuss (14) WAEC 2020
4388

The sketched graph above illustrates the heating curve of a 0.02kg of water. Determine the approximate value of the specific latent heat of vapourization of water
 

  • A. 2.25 x 10\(^6\) J kg\(^{-1}\)
  • B. 4.17 x 10\(^3\) J kg\(^{-1}\)
  • C. 2.00 x 10\(^3\) J kg\(^{-1}\)
  • D. 1.00 x 10\(^3\) J kg\(^{-1}\)
View Answer & Discuss (5) WAEC 2020
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4389

 In the hydraulic press, the force F applied is related to the diameter d of the cylinder by 
 

  • A. F \(\alpha\) d\(^2\)
  • B. F \(\alpha\) d
  • C. F \(\alpha\) d\(^{-1}\)
  • D. F \(\alpha\) d\(^{-2}\)
View Answer & Discuss (3) WAEC 2020
4390

 In an electric circuit, an inductor of inductance 0.5 H and resistance 50\(\Omega\) is connected to an alternating current source of frequency 60 Hz. Calculate the impedance of the circuit.

  • A. 50.0\(\Omega\)
  • B. 450.5 \(\Omega\)
  • C. 195.0 \(\Omega\)
  • D. 1950.1 \(\Omega\)
View Answer & Discuss (8) WAEC 2020
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