Thermodynamics: Heat Loss and Black Body Radiation Quiz

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What is the surface tension of the soap solution?

2.5 x 10^-2 J

6.28 x 10^-3 N/m (correct)

62.84 x 10^-2 N/m

25 x 10^-2 J

Why is a black body considered a perfect emitter and absorber of radiation?

Because it reflects all radiation

It absorbs all incident radiation and emits the maximum possible amount (correct)

It has high heat conductivity

Due to its color

Which law states that the emissive power of a black body is proportional to the fourth power of its absolute temperature?

Kirchhoff's law of radiation

Boltzmann's law

Wein's displacement law

Stefan-Boltzmann law (correct)

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 Signup and view all the answers

What does Boyle's Law state regarding the volume and pressure of a gas?

Volume is inversely proportional to pressure at a constant temperature Signup and view all the answers

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 Signup and view all the answers

Which law of thermodynamics states that the total internal energy of a system remains constant in a thermodynamic process?

First law Signup and view all the answers

What is the term for a process in which there is no change in temperature?

Isothermal process Signup and view all the answers

Which type of equilibrium refers to the state where two objects are at the same temperature?

Thermal equilibrium Signup and view all the answers

What is the term for a process that occurs without the exchange of heat with the surroundings?

Adiabatic process Signup and view all the answers

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 Signup and view all the answers

What is the term for a process where there is no change in volume?

Isochoric process Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

At what temperature will the average kinetic energy of a gas be exactly half of its value at N.T.P.?

273°C Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

Thermodynamics: Heat Loss and Black Body Radiation Quiz

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Questions and Answers

What is the surface tension of the soap solution?

Why is a black body considered a perfect emitter and absorber of radiation?

Which law states that the emissive power of a black body is proportional to the fourth power of its absolute temperature?

How does the root mean square (R.M.S) velocity of gas molecules relate to the absolute temperature of the gas?

What does Boyle's Law state regarding the volume and pressure of a gas?

What property makes a perfectly black body unique compared to other bodies in terms of radiation?

Which law of thermodynamics states that the total internal energy of a system remains constant in a thermodynamic process?

What is the term for a process in which there is no change in temperature?

Which type of equilibrium refers to the state where two objects are at the same temperature?

What is the term for a process that occurs without the exchange of heat with the surroundings?

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?

What is the term for a process where there is no change in volume?

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?

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?

At what temperature will the average kinetic energy of a gas be exactly half of its value at N.T.P.?

If a black body loses heat at 627°C and another at 327°C, what is the ratio of their heat loss rates?

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?

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?

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