IB DP Physics: Thermal physics

Question 1

Under which conditions will a real gas more closely resemble an ideal gas?

Accepted Answer

High temperature and low pressure

Question 2

Air conditioning reduces the temperature of air. The pressure remains constant. What happens to the density of the air?

Accepted Answer

increases

Question 3

A poker is used to move pieces of fuel burning in a fire. To be as safe, the poker is made from a material that ______

Accepted Answer

has a high heat capacity.

Question 4

If 4.0 kg of water at 90°C is mixed with 1.0 kg of water at 10°C, what is the final temperature of the water?

Accepted Answer

74°C

Question 5

In an aircraft you may feel a reduction in the air pressure. What is the explanation for this on a molecular level?

Accepted Answer

Air particles are colliding with the walls of the plane less frequently.

Question 6

Energy is transferred to an object so its temperature goes from 10°C to 50°C. What is the temperature change in kelvin?

Accepted Answer

40 K

Question 7

If a gas is compressed rapidly by a piston why does its temperature increase?

Accepted Answer

The moving piston transfers energy to the molecules of the gas.

Question 8

Which two values of temperature are the closest?

Accepted Answer

320 K and 40°C

Question 9

Temperature is best understood as being:

Accepted Answer

A measure of the average kinetic energy of its particles.

Question 10

A solid with a melting point of 35°C is heated. The slope of the first part of the graph depends upon what property?

Accepted Answer

Specific heat capacity as a solid

Question 11

The temperature of an ideal gas is a measure of the gas particles' _______

Accepted Answer

average kinetic energy.

Questions 11