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

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

Correct Answer: Option B

Explanation

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