Solved 2024 Question Paper ICSE Class 10 Physics — Question 14

Specific heat capacity

Reason — When no energy is lost to the surrounding, the amount of heat energy supplied is directly proportional to the change in temperature △t i.e.

$\text Q ∝ △\text t\\[1em] \text {or} \\[1em] \text Q = \text {mc} △\text t$

Where,

m : mass of a substance

c : specific heat capacity of the substance

So,

$\dfrac {\text Q}{△\text t} = \text {mc}$

For a given mass,

$\text {Slope of Q vs △\text t graph} = \dfrac {\text Q}{△\text t} ∝ \text c = \text {constant}$

Hence, slope of Q vs △t graph gives the value of the specific heat capacity of the substance.