EASY
12th Maharashtra Board
IMPORTANT
Earn 100

A car is left in sunlight with all its windows closed on a hot day. After some time it is observed that the inside of the car is warmer than outside air. Why? 
 

Important Questions on Kinetic Theory of Gases and Radiation

EASY
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 3 - Kinetic Theory of Gases and Radiation>Use your brain power>Q •
If surfaces of all bodies are continuously emitting radiant energy, why do they not cool down to 0 K? 
EASY
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 3 - Kinetic Theory of Gases and Radiation>Can you tell?>Q 1
λmax the wavelength corresponding to maximum intensity for the Sun is in the blue-green region of visible spectrum. Why does the Sun then appear yellow to us? 
 
EASY
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 3 - Kinetic Theory of Gases and Radiation>Exercises>Q 1
In an ideal gas, the molecules possess
MEDIUM
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 3 - Kinetic Theory of Gases and Radiation>Exercises>Q 1

The mean free path λ of molecules is given by 

where n is the number of molecules per unit volume and d is the diameter of the molecules.

MEDIUM
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 3 - Kinetic Theory of Gases and Radiation>Exercises>Q 1
If pressure of an ideal gas is decreased by 10% isothermally, then its volume will
EASY
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 3 - Kinetic Theory of Gases and Radiation>Exercises>Q 1
 If a=0.72 and r=0.24, then the value of tr. is
MEDIUM
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 3 - Kinetic Theory of Gases and Radiation>Exercises>Q 1
The ratio of emissive power of a perfect blackbody at 1327 °C and 527 °C is
EASY
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 3 - Kinetic Theory of Gases and Radiation>Exercises>Q 2
What will happen to the mean square speed of the molecules of a gas if the temperature of the gas increases?