An electric kettle rated 1500W boils away 0.3kg of a liquid at its boiling point every 300s. Calculate the specific latent heat of the vaporisation of the liquid
-
A.
1.5 x (10^6Jkg^-1) -
B.
1.35 x (10^6Jkg^-1) -
C.
1.5 x (10^5Jkg^-1) -
D.
4.5 x (10^2Jkg^-1) -
E.
3 x (10^2Jkg^-1)
Correct Answer: Option A
Explanation
Pt=mI; I=(frac{1500times300}{0.3}=1.5times10^6Jkg^-1)