A 90-W immersion heater is used to supply energy for five minutes. The energy supplied is used to completely melt 180g of a solid at is melting point. Neglecting energy losses to the surroundings, calculate the specific latent heat of fusion of the solid
A
0.5Jg-1
B
2.5Jg-1
C
15.0Jg-1
D
450.0Jg-1
E
150Jg-1
Verified Correct Answer: E.
Physical Principles & Numerical Solution
Pt = mL
L = \(\frac{pt}{m} = \frac{90 \times 60 \times 5}{180}\)
= 150Jg\(^{-1}\)
Source: Myschool Past Questions Archive (Record #33594)