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An immersion heater rated 400W, 220V is used to heat a liquid of mass 0.5kg....

Physics
WAEC 2005
An immersion heater rated 400W, 220V is used to heat a liquid of mass 0.5kg. If the temperature of the liquid increases uniformly at the rate of 2.5oC per second, calculate the specific heat capacity of the liquid. [Assume no heat is lost]
  • A. 1100Jkg-1K-1
  • B. 320Jkg-1K-1
  • C. 200Jkg-1K-1
  • D. 176Jkg-1K-1
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Correct Answer: Option B
Explanation
pt = mc\(\theta\)

C = \(\frac{pt}{m \theta}\)

= \(\frac{400 \times 1}{0.5 \times 2.5}\)

= 320Jkg-1K-1
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