Advertisements
Advertisements
प्रश्न
Write an expression for the heat energy liberated by a hot body.
What is the expression for the heat energy liberated by a hot body?
Advertisements
उत्तर
H = m × c × ΔT
where m is mass, c is specific heat capacity, and ΔT is the change in temperature.
APPEARS IN
संबंधित प्रश्न
In an experiment on the specific heat of a metal, a 0.20 kg block of the metal at 150 °C is dropped in a copper calorimeter (of water equivalent 0.025 kg) containing 150 cm3 of water at 27 °C. The final temperature is 40 °C. Compute the specific heat of the metal. If heat losses to the surroundings are not negligible, is your answer greater or smaller than the actual value for the specific heat of the metal?
The coolant in a chemical or a nuclear plant (i.e., the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat.
The farmers fill their fields with water in winter. Give reason.
Is it possible to condense the water formed, back to ice by adding ice at 0°C. Explain with reason.
Ice-cream at 0°C feels colder than water at 0°C. Give reason for this observation.
Describe a method to determine the specific heat capacity of a solid (say, a piece of copper).
50 g of copper is heated to increase its temperature by 10° C. If the same quantity of heat is given to 5 g water, the rise in its temperature is [Specific heat of copper = 420 joule-kg-1 °C-1 , specific heat of water = 4200 joule-kg-I °C-1]
Observe the following diagram and answer the questions given below:
Specific heat capacity of metals
- Which element has maximum specific heat capacity? Justify.
- Which element has minimum specific heat capacity? Justify.
- Define specific heat of object.
