## Given below are densities of some solids and liquids. Give rough estimates of the size of their atoms: | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-13 Kinetic Theory

Q.14:- Given below are densities of some solids and liquids. Give rough estimates of the size of their atoms: [Hint: Assume the atoms to be ‘tightly packed’ in a solid…

## A gas in equilibrium has uniform density and pressure throughout its volume. This is strictly true only if there are no external influences. A gas column under gravity, for example, does not have uniform density (and pressure). As you might expect, its density decreases with height. | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-13 Kinetic Theory

Q.13:- A gas in equilibrium has uniform density and pressure throughout its volume. This is strictly true only if there are no external influences. A gas column under gravity, for example,…

## From a certain apparatus, the diffusion rate of hydrogen has an average value of 28.7 cm3 s–1. The diffusion of another gas under the same conditions is measured to have an average rate of 7.2 cm3 s–1. Identify the gas. | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-13 Kinetic Theory

Q.12:- From a certain apparatus, the diffusion rate of hydrogen has an average value of 28.7 cm3 s–1. The diffusion of another gas under the same conditions is measured to have…

## A metre long narrow bore held horizontally (and closed at one end) contains a 76 cm long mercury thread, which traps a 15 cm column of air. What happens if the tube is held vertically with the open end at the bottom? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-13 Kinetic Theory

Q.11:- A metre long narrow bore held horizontally (and closed at one end) contains a 76 cm long mercury thread, which traps a 15 cm column of air. What happens if…

## Estimate the mean free path and collision frequency of a nitrogen molecule in a cylinder containing nitrogen at 2.0 atm and temperature 17 °C. Take the radius of a nitrogen molecule to be roughly 1.0 Å. Compare the collision time with the time the molecule moves freely between two successive collisions (Molecular mass of N2 = 28.0 u). | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-13 Kinetic Theory

Q.10:- Estimate the mean free path and collision frequency of a nitrogen molecule in a cylinder containing nitrogen at 2.0 atm and temperature 17 °C. Take the radius of a nitrogen…

## At what temperature is the root mean square speed of an atom in an argon gas cylinder equal to the rms speed of a helium gas atom at – 20 °C? (atomic mass of Ar = 39.9 u, of He = 4.0 u). | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-13 Kinetic Theory

Q.9:- At what temperature is the root mean square speed of an atom in an argon gas cylinder equal to the rms speed of a helium gas atom at – 20…

## Three vessels of equal capacity have gases at the same temperature and pressure. The first vessel contains neon (monatomic), the second contains chlorine (diatomic), and the third contains uranium hexafluoride (polyatomic). Do the vessels contain equal number of respective molecules? Is the root mean square speed of molecules the same in the three cases? If not, in which case is vrms the largest? | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-13 Kinetic Theory

Q.8:- Three vessels of equal capacity have gases at the same temperature and pressure. The first vessel contains neon (monatomic), the second contains chlorine (diatomic), and the third contains uranium hexafluoride…

## Estimate the average thermal energy of a helium atom at (i) room temperature (27 °C), (ii) the temperature on the surface of the Sun (6000 K), (iii) the temperature of 10 million Kelvin (the typical core temperature in the case of a star). | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-13 Kinetic Theory

Q.7:- Estimate the average thermal energy of a helium atom at (i) room temperature (27 °C), (ii) the temperature on the surface of the Sun (6000 K), (iii) the temperature of…