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: Option D
Explanation
Heat energy = Elect. energy
0.5 x 2.3 x 106 = 100t
t = 1.15 x 104s