Question on: JAMB Physics - 2009
A heating coil rated 1000 W is used to boil off completely 2 kg of boiling water. the time required to boil of the water is_______
[Special latent heat of Vaporization of water = 2.3 x 106 Jkg-1]
A
1.15 x 104s
B
1.15 x 103s
C
4.6 x 104s
D
4.6 x 103s
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Correct Option: D
Heat supplied = Heat gained
pt = ml
T = (ml)/p = (2 x 2.3 x 106)/1000 = 4.6 x 103 sec
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