How much heat should be transferred to a 100 g block of silver to raise its temperature by 40 °C? (Specific heat of silver is 236 Jkg^-1K^-1)

Question

Question

This question was previously asked in

RRB ALP Electrician 22 Jan 2019 Official Paper (Shift 3)

Answer 1

Concept:

Specific heat capacity:

It can be defined as the amount of heat required to change its temperature by one degree.
Mathematically, heat required, Q = mcΔT,
where m = mass, c = specific heat capacity, ΔT = temperature difference
The heat can be measured in Joule (J).

Calculation:

Given: mass, m = 100 g = g 0.1 kg, Temperature difference, ΔT = 40ºC, Specific heat of silver, c = 236 J/ kg K

The heat required, Q = mcΔT

Q = 0.1 × 236 × 40

Q = 944 J

Hence, the energy required to rise a certain given temperature is 944 J.