Physics 2016 JAMB Past Questions - Question 4: Calculate the temperature change when 500 J of heat is supplied to 100g of water.

Correct Answer

C

Explanation

To calculate the temperature change when heat is supplied to a substance, we can use the formula:

Q = mcΔT

Where:
Q is the heat energy supplied (in joules),
m is the mass of the substance (in grams),
c is the specific heat capacity of the substance (in J/g°C), and
ΔT is the change in temperature (in °C).

For water, the specific heat capacity is approximately 4.18 J/g°C.

Given:
Q = 500 J
m = 100 g
c = 4.18 J/g°C

Let's calculate the temperature change (ΔT):

Q = mcΔT
ΔT = Q / (mc)
ΔT = 500 J / (100 g * 4.18 J/g°C)

Calculating the value:

ΔT = 1.1964 °C

Therefore, when 500 J of heat is supplied to 100 g of water, the temperature change is approximately 1.20 °C.