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A heater marked 50W will evaporate 0.005kg of boiling water in 50 seconds. The specific...

Physics
JAMB 1982
A heater marked 50W will evaporate 0.005kg of boiling water in 50 seconds. The specific latent heat of vaporization of water in J/kg is
  • A. 5.0 x 106
  • B. 1.0 x 106
  • C. 2.5 x 106
  • D. 2.5 x 105
  • E. 5.0 x 105
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Correct Answer: Option E
Explanation
Heat energy = Electrical energy

mL = power x time

0.005 x L = 50 x 50

L = 5 x 105J/kg
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