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 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

jamb 1997 physics

The correct answer is D. 1.15 x 10⁴ s

Heat energy = Elect. energy

0.5 x 2.3 x 10⁶ = 100t

t = 1.15 x 10⁴s

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