Physics for the IB Diploma 6th Edition>Chapter 3 - Thermal Physics>Test yourself>Q 30

MEDIUM

Diploma

IMPORTANT

Earn 100

Calculate the average speed (r.m.s) of helium atoms at a temperature of $850 K$ . The molar mass of helium is $4.0 g {mol}^{- 1}$ .

Important Questions on Thermal Physics

HARD

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 3 - Thermal Physics>Test yourself>Q 31

Show that the average (r.m.s) speed of molecules of gas of molar mass

M

(in kg {mol}^{- 1})

kept at a temperature

T

is given by

c = \sqrt{\frac{3 R T}{M}}

.

EASY

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 3 - Thermal Physics>Test yourself>Q 32

Calculate the average random kinetic energy of a gas kept at a temperature of

300 K

.

MEDIUM

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 3 - Thermal Physics>Test yourself>Q 32

Determine the ratio of the average speeds (r.m.s. speed) of ideal gases of molar mass

4.0 g {mol}^{- 1} and 32 g {mol}^{- 1}

, which are kept at the same temperature.

MEDIUM

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 3 - Thermal Physics>Exam-style questions>Q 1

Body

X

whose temperature is

0^{o} C

is brought into thermal contact with body

Y

of equal mass and temperature

100^{o} C

. The only exchange of heat that takes place are between

X

and

Y

. The specific heat capacity of

X

is greater than that of

Y

. Which statement about the final equilibrium temperature

T (i n^{o} C)

of the two bodies is correct?

MEDIUM

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 3 - Thermal Physics>Exam-style questions>Q 2

Energy is provided to a liquid at its boiling point at a rate of

P

joules per second. The rate at which mass is boiling away is

μ

kg per second. What is the specific latent heat of vaporisation of the liquid?

EASY

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 3 - Thermal Physics>Exam-style questions>Q 3

All the following are assumptions of the kinetic theory of gases, except which one ?

EASY

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 3 - Thermal Physics>Exam-style questions>Q 5

The temperature of an ideal gas of pressure

200 k P a

is increased from

27^{o} C

to

54^{o} C

at constant volume. Which is the best estimate for the new pressure

(i n k P a)

of the gas?

MEDIUM

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 3 - Thermal Physics>Exam-style questions>Q 6

A container of an ideal gas that is isolated from its surroundings is divided into two parts. One part has double the volume of the other. The pressure in each part is

P

and the temperature is the same. The partition is removed. What is the pressure in the container now?