Advertisements
Advertisements
प्रश्न
Why are athletes advised to put on extra clothes after competing on event?
Advertisements
उत्तर
Athletes perspire profusely after competing in an event. The latent heat of evaporation of the ‘sweat’ is withdrawn from the body itself and therefore, cools the body. Hence, if they do not put on extra clothes, they are likely to catch cold.
संबंधित प्रश्न
What do you understand by the following statements:
The heat capacity of the body is 60JK-1.
Give a mathematical relation between Heat Capacity and Specific Heat Capacity.
Ice cream appears colder to the mouth than water at 0℃. Give reason.
The substances like water which have ........... Heat capacity warm up more slowly than substances like iron which have .......... heat capacity.
Write two advantages of high specific heat capacity of water.
Why is specific heat capacity taken as a measure of thermal inertia?
Will the value of specific heat’capacity and specific latent heat of a substance change if the scale is °F instead of °C?
Decide the unit for specific heat capacity.
Read this activity and answer the following questions.
- Take three spheres of iron, copper and lead. the lead of equal mass.
- Put all the three spheres in boiling water in the beaker for some time.
- Take the three spheres out of the water.
- All the spheres will be at a temperature 100 °C.
- Put them immediately on the thick slab of wax.
- Note, the depth that each of the sphere goes into the wax.
Questions:
- Which property is determined from this activity?
- Give name to that property.
- Explain the term principal of heat exchange with the help of this activity.
For a gas `"R"/"C"_"v" = 0.4,` where 'R' is the universal gas constant and 'Cv' is molar specific heat at constant volume. The gas is made up of molecules which are ______.
