In physics, the mean free path is the average distance traveled by a moving particle (such as an atom , a molecule, a photon) between successive impacts (collisions), which modify its direction or energy or other particle properties. In which of the following mean free path is used ?

to estimate the resistivity of a material

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to design a chemical apparatus

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It can be used in optics and in acoustics

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All of the above

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Solution

The correct option is B All of the above
The concept of mean free path is popular in all branches of physics and it has a number of applications including estimation of resistivity of material, designing a chemical apparatus, and optics and acoustics, etc.

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Q. Estimate the number of collisions per second suffered by a molecule in a sample of hydrogen at STP. The mean free path (average distance covered by a molecule between successive collisions) = 1.38 × 10⁻⁵ cm.

Q. Estimate the number of collision per second suffered by a molecule in a sample of hydrogen at STP. The mean free path (average distance covered by a molecule between successive collisions)

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Q. A molecule of a gas, filled in a discharge tube, gets ionised when an electron is detached from it. An electric field of 5.0 kV m⁻¹ exists in the vicinity of the event. (a) Find the distance travelled by the free electron in 1 µs, assuming there's no collision. (b) If the mean free path of the electron is 1.0 mm, estimate the time of transit of the free electron between successive collisions.

Q. An ideal gas in a closed container is slowly heated. As its temperature increases, which of the following statements are true ?

(a)

The mean free path of the molecules decreases

(b)

The mean collision time between the molecules decreases

(c)

The mean free path remains unchanged

(d)

The mean collision time remains unchanged

Since molecules undergo frequent collisions with each other in a volume of a gas, they move in straight lines at a constant speed only between one collision and the next. The average distance traversed between successive collisions is called the mean free path, $λ$ . Among the given options, contemplate and choose the option(s) on which $λ$ should not explicitly depend

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In physics, the mean free path is the average distance traveled by a moving particle (such as an atom , a molecule, a photon) between successive impacts (collisions), which modify its direction or energy or other particle properties. In which of the following mean free path is used ?

The correct option is B All of the aboveThe concept of mean free path is popular in all branches of physics and it has a number of applications including estimation of resistivity of material, designing a chemical apparatus, and optics and acoustics, etc.

The correct option is B All of the above
The concept of mean free path is popular in all branches of physics and it has a number of applications including estimation of resistivity of material, designing a chemical apparatus, and optics and acoustics, etc.