A 90W immersion heater is used to supply energy... - WAEC Physics 1991 Question
A 90W immersion heater is used to supply energy for 5 minutes. The energy supplied is used to completely melt 160g of a solid at its melting point. Calculate the specific latent heat of the solid.
A
2.81jg-1
B
6.25Jg-1
C
8.89Jg-1
D
168.75Jg-1
correct option: d
pt = ml 80
90 x 5 x 60 = 160 x L
L = \(\frac{27000}{160}\)
= 168.75Jg-1
= 168.75
90 x 5 x 60 = 160 x L
L = \(\frac{27000}{160}\)
= 168.75Jg-1
= 168.75
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