Advertisements
Advertisements
प्रश्न
Is heat a conserved quantity?
Advertisements
उत्तर
Yes, heat is a conserved quantity. Suppose two bodies A and B are at different temperatures, wherein A is higher and B is lower. When they are brought in contact, the heat given by A is equal to the heat gained by B. Thus, the heat is conserved in the system.
Here, we have ignored the heat exchanged with the surroundings. If we consider the surroundings, the heat of the system will be conserved.
APPEARS IN
संबंधित प्रश्न
Two copper spheres of radii 6 cm and 12 cm respectively are suspended in an evacuated enclosure. Each of them are at a temperature 15°C above the surroundings. The ratio of their rate of loss of heat is.................
- 2:1
- 1:4
- 1:8
- 8:1
A pinhole is made in a hollow sphere of radius 5 cm whose inner wall is at temperature 727oC. Find the power radiated per unit area. [Stefan’s constant σ = 5.7 x 10-8 J/m2 s K4 , emissivity (e) = 0.2]
The light from the Sun is found to have a maximum intensity near the wavelength of 470 nm. Assuming the surface of the Sun as a black body, the temperature of the Sun is _____________.
[Wien's constant b = 2 .898 x l0- 3mK]
What is the temperature of the triple-point of water on an absolute scale whose unit interval size is equal to that of the Fahrenheit scale?
Can the bulb of a thermometer be made of an adiabatic wall?
The density of water at 4°C is supposed to be 1000 kg m–3. Is it same at sea level and at high altitude?
An aluminium sphere is dipped into water at 10°C. If the temperature is increased, the force of buoyancy
A body A is placed on a railway platform and an identical body B in a moving train. Which of the following energies of B are greater than those of A, as seen from the ground?
(a) Kinetic
(b) Total
(c) Mechanical
(d) Internal
As the temperature is increased, the time period of a pendulum
Heat and work are equivalent. This means, ____________ .
A railway track (made of iron) is laid in winter when the average temperature is 18°C. The track consists of sections of 12.0 m placed one after the other. How much gap should be left between two such sections, so that there is no compression during summer when the maximum temperature rises to 48°C? Coefficient of linear expansion of iron = 11 × 10–6 °C–1.
A steel rod of length 1 m rests on a smooth horizontal base. If it is heated from 0°C to 100°C, what is the longitudinal strain developed?
‘An object contains more heat’- is it a right statement? If not why?
Temperature and Heat are ______
Temperature in the form of energy.
Analogy
Evaporation:: 100°C: Freezing:: ______.
Which formula gives the average kinetic energy per molecule of an ideal gas?
What condition defines thermal equilibrium between two bodies?
What is the best description of heat in thermodynamics?
