A heating coil rated at 100W is used to boil off 0.5kg of boiling water....
PHYSICS
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
Correct Answer: D. 1.15 x 104 s
Explanation
Heat energy = Elect. energy
0.5 x 2.3 x 106 = 100t
t = 1.15 x 104s
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