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A 90-W immersion heater is used to supply energy for five minutes. The energy supplied...

Physics
WAEC 1998

A 90-W immersion heater is used to supply energy for five minutes. The energy supplied is used to completely melt 180g of a solid at is melting point. Neglecting energy losses to the surroundings, calculate the specific latent heat of fusion of the solid

  • A. 0.5Jg-1
  • B. 2.5Jg-1
  • C. 15.0Jg-1
  • D. 450.0Jg-1
  • E. 150Jg-1
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Correct Answer: Option E
Explanation

Pt = mL

L = \(\frac{pt}{m} = \frac{90 \times 60 \times 5}{180}\)

= 150Jg\(^{-1}\)

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