Physics
Two bodies A and B are of the same material but A has twice the mass of B. Both are heated up to the same temperature. Identify the correct statement ?
- Heat absorbed by A is half of that by B.
- Heat absorbed by A is equal to that by B.
- Heat absorbed by A is twice of that by B.
- Heat absorbed by A is four times that by B.
Answer
Heat absorbed by A is twice of that by B.
Reason — The heat absorbed by a body is given by
Q = mcΔt
where
- m is mass,
- c is specific heat capacity, and
- Δt is the change in temperature.
Since both bodies are made of the same material, their specific heat capacity is the same and they are heated through the same temperature change, Δt is also the same.
Therefore, heat absorbed is directly proportional to mass and since body A has twice the mass of body B so it absorbs twice the amount of heat.
Hence, heat absorbed by A is twice of that by B.
Related Questions
Heat energy supplied during the melting of a substance is utilised in :
- increasing the kinetic energy of molecules
- decreasing the potential energy of molecules
- increasing the potential energy of molecules
- decreasing the kinetic energy of molecules
The curve which shows the rise of temperature with the amount of heat supplied for a piece of ice is :
- A
- B
- C
- D
A large bucket of water at 40 °C and a small cup of water at 80 °C are kept on a table. Which of them has higher heat content ?
- The cup of water.
- The bucket of water.
- Both of them have an equal heat content.
- Cannot be said without knowing the mass of the water in each.
Assertion (A): A desert becomes extremely hot in day time and very cold at night.
Reason (R): Sand has high specific heat capacity.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false