At what temperature the kinetic energy of a molecule will be equal to 2 . 8 × 10 - 28 J ? Boltzmann constant ( k ) = 1 . 4 × 10 - 23 J K - 1 .

We know that, Kinetic energy, E = 3 2 n R T = 3 2 k T From the question, 2 . 8 × 10 - 20 = 3 2 × 1 . 4 × 10 - 23 × T or T = 1 . 33 × 10 3 K .

E M B I B E

ISC Physics Class XI Part 1>Chapter 20 - Kinetic Theory of Gases>NUMERICALS>Q 20

HARD

11th ICSE

IMPORTANT

Earn 100

The density of hydrogen at normal temperature and pressure is $0.09 {kgm}^{- 3}$ . What will be the root- mean-square speed of its molecules? What of oxygen? Oxygen is $16$ times heavier than hydrogen.

Important Questions on Kinetic Theory of Gases

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 20 - Kinetic Theory of Gases>NUMERICALS>Q 21

The root-mean-square speed of oxygen molecules at a certain temperature is

150 m s^{- 1}

. Calculate the root-mean-square speed of hydrogen molecules at the same temperature. Molecular weights of oxygen and hydrogen are respectively

32

and

2

.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 20 - Kinetic Theory of Gases>NUMERICALS>Q 22

What will be the ratio of the root-mean-square speeds of the molecules of an ideal gas at

270 K

and

30 K

?

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 20 - Kinetic Theory of Gases>NUMERICALS>Q 23

At what temperature will the root-mean-square velocity of molecules of a gas be twice the root- mean-square velocity at

0 ° C

? At what temperature

1.5

times?

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 20 - Kinetic Theory of Gases>NUMERICALS>Q 24

At what temperature will the effective speed (root-mean-square speed) of oxygen molecule be equal to the effective speed of nitrogen molecule at

0 ° C

?

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 20 - Kinetic Theory of Gases>NUMERICALS>Q 25

The root-mean-square speed of oxygen molecules at

0 ° C

is

460 m s^{- 1}

. What will be the speed of helium molecules at

40 ° C

? The molecular weight of oxygen is

32 g m o l^{- 1}

while that of helium is

4 g m o l^{- 1}

.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 20 - Kinetic Theory of Gases>NUMERICALS>Q 26

At what temperature the kinetic energy of a molecule will be equal to

2.8 \times 10^{- 28} J

? Boltzmann constant

(k) = 1.4 \times 10^{- 23} J K^{- 1}

.

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 20 - Kinetic Theory of Gases>NUMERICALS>Q 27

The temperature of a gas is

0 ° C

. In each case to what temperature should it be heated so that the average kinetic energy of its molecule is doubled.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 20 - Kinetic Theory of Gases>NUMERICALS>Q 27

The temperature of a gas is

0 ° C

. In each case to what temperature should it be heated so that the root-mean-square velocity of its molecules is doubled?

Learn and Prepare for any exam you want !

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The density of hydrogen at normal temperature and pressure is 0.09 kgm-3. What will be the root- mean-square speed of its molecules? What of oxygen? Oxygen is 16 times heavier than hydrogen.

Important Questions on Kinetic Theory of Gases

Learn and Prepare for any exam you want !

The density of hydrogen at normal temperature and pressure is $0.09 {kgm}^{- 3}$ . What will be the root- mean-square speed of its molecules? What of oxygen? Oxygen is $16$ times heavier than hydrogen.