18 Questions
What is the surface tension of the soap solution?
6.28 x 10^-3 N/m
Why is a black body considered a perfect emitter and absorber of radiation?
It absorbs all incident radiation and emits the maximum possible amount
Which law states that the emissive power of a black body is proportional to the fourth power of its absolute temperature?
Stefan-Boltzmann law
How does the root mean square (R.M.S) velocity of gas molecules relate to the absolute temperature of the gas?
It is directly proportional to the square root of absolute temperature
What does Boyle's Law state regarding the volume and pressure of a gas?
Volume is inversely proportional to pressure at a constant temperature
What property makes a perfectly black body unique compared to other bodies in terms of radiation?
It emits the maximum possible radiation at every wavelength
Which law of thermodynamics states that the total internal energy of a system remains constant in a thermodynamic process?
First law
What is the term for a process in which there is no change in temperature?
Isothermal process
Which type of equilibrium refers to the state where two objects are at the same temperature?
Thermal equilibrium
What is the term for a process that occurs without the exchange of heat with the surroundings?
Adiabatic process
Which law of thermodynamics states that if two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other?
Zeroth law
What is the term for a process where there is no change in volume?
Isochoric process
If a body cools from 80°C to 70°C in 5 minutes and then to 62°C in the next 5 minutes, what is the rate of cooling of the body?
2.5°C/min
When a body cools at the rate of 0.5°C/min at 25°C above the surroundings, what is the rate of cooling when it is 15°C above the same surroundings?
0.3°C/min
At what temperature will the average kinetic energy of a gas be exactly half of its value at N.T.P.?
273°C
If a black body loses heat at 627°C and another at 327°C, what is the ratio of their heat loss rates?
5.5:1
If the difference between two molar specific heats of a gas is 6000 J/kg.K and the ratio of specific heats is 1.4, what is the molar specific heat at constant volume?
21000 J/kg K
Given that the difference between two molar specific heats of a gas is 9000 J/kg K and the ratio of specific heats is 1.5, what are the two molar specific heats?
$C_v = 27000$ J/kg K; $C_p = 18000$ J/kg K
Test your knowledge on calculating energy radiated by a black body and comparing heat loss rates from metal spheres at different temperatures. Questions cover topics such as the first law of thermodynamics and practical applications of heat transfer.
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