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
Verified Correct Answer: D.
Physical Principles & Numerical Solution
Heat energy = Elect. energy
0.5 x 2.3 x 106 = 100t
t = 1.15 x 104s
Source: Myschool Past Questions Archive (Record #27696)