Физика 202-303

How will the root mean square speed of nitrogen molecules change if the temperature of the gas increases 4 times?

• will decrease by 2 times

• will decrease by 4 times

• will increase 4 times

• will increase 2 times

• will not change

What causes Brownian motion?

• collision of molecules of a liquid (or gas) with particles suspended in it

• collision of particles suspended in a liquid (or gas)

• collision of liquid (or gas) molecules with each other

• thermal movement of liquid particles

• none of the above reasons

A vessel with a capacity of 0.83 m^3 contains helium. Gas mass 0.16 kg. At what temperature does helium exert a pressure of 60 kPa on the walls of the vessel?

• Т= 300К

• Т=300⁰С

• Т=150⁰С

• Т= 150 К

• Т= 2,4•10^3 К

Estimate approximately the mass of 1 m^3 of air at normal atmospheric pressure and temperature 300 K. Select from the values below the closest to the result you obtained.

• 1 g

• 10 kg

• 1 kg

• 100 g

• 10 g

If a gas is under normal conditions, then its pressure and temperature are equal:

• Р= 0 Pa, t=0⁰ C

• Р= 0, Т= 273 К

• Р=10^5 Pa, Т= 0 К

• Р= 100 kPa, Т= 273 К

• Р= 1 atm, temperature could be any

The mean square speed of molecules of a certain gas in the first vessel is 3 times greater than the mean square speed of molecules of the same gas in the second vessel. What is the ratio of gas densities in the first and second vessels if the gas pressure is the same?

• 1/3

• 9

• 1/9

• 1

• 3

How many degrees of freedom does a diatomic gas molecule have?

• could be any;

• i = 5

• i = 3

• i = 6

• i = 7

When an ideal gas was heated, the mean square speed of thermal motion of molecules increased 4 times. How did the absolute temperature of the gas change?

• increased 16 times

• increased 2 times

• increased 12 times

• increased 4 times

• increased 8 times

Which of the following formulas is the basic equation of the molecular kinetic theory of an ideal gas?

• 
• 
• 
• 
• 

During isobaric heating, an ideal gas is transferred from state 1 to state 2. How did the gas pressure change? The mass of the gas is constant.

• has not changed.

• decreased.

• increased.

• you need to know the mass of the gas.

• there may be different answers for different gases.