A heating coil rated at 100W is used to boil off 0.5kg of boiling water....

JAMB 1997

A heating coil rated at 100W is used to boil off 0.5kg of boiling water. The time taken to boil off the water is [specific latent heat of vaporization of water = 2.3 x 10⁶Jkg^-1]

A. 1.15 x 10⁹ s
B. 1.15 x 10⁷ s
C. 1.15 x 10⁵ s
D. 1.15 x 10⁴ s

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Correct Answer: Option D

Explanation

Heat energy = Elect. energy

0.5 x 2.3 x 10⁶ = 100t

t = 1.15 x 10⁴s

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A heating coil rated at 100W is used to boil off 0.5kg of boiling water....

Correct Answer: Option D

Explanation

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