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Standard IX

Physics

Propagation of Sound through Solids, Liquids and Gases

Sound Velocit...

Question

Sound Velocity is maximum in :

H_{2}

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N_{2}

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H e

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O_{2}

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Solution

The correct option is A $H_{2}$
For gases, the speed of sound in any gas is a function of temperature, the molecular structure of the gas and its molecular mass. The lighter a molecule is, the faster it moves (at given temperature), and the speed of sound in gases is simply proportional to the speed (on average) of the molecules.
Since, the molecular weight of hydrogen( $H = 1$ ) is very less as compared to other gases( $O = 16$ , $N = 14$ , $H e = 4$ ), hence molecules of $H_{2}$ are lighter than other gas molecules so, velocity of sound is maximum in it.

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Similar questions

Q. Identify the correct order of velocity (speed) of sound. Given,

v_{O_{2}} =

velocity of sound in

O_{2}

gas

v_{N_{2}} =

velocity of sound in

N_{2}

gas

v_{H_{2}} =

velocity of sound in

H_{2}

gas

v_{C l_{2}} =

velocity of sound in

C l_{2}

gas.

Q. At

S T P

the order of mean square velocity of molecules of

H_{2}, N_{2}, O_{2}

and

H B r

is-

Q. Gases

H_{2} H e O_{2} N_{2}

Critical temperature(K) 33.2 5.3 154.3 126

From the above data what whould be the order of liquefaction of these gases?
Start writing the order from the gas liquefying first.

Gases posses charcteristic critical temperature which depends upo the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.

$\begin{matrix} G a s e s & H_{2} & H e & O_{2} & N_{2} C r i t i c a l t e m p e r a t u r e i n K e l v i n & 33.2 & 5.3 & 154.3 & 126 \end{matrix}$

From the above data what would be the order of liquefaction of these gases? Start writing the order from the gas liquefying first

(a) $H_{2}, H e, O_{2}, N_{2}$ (b) $H e, O_{2}, H_{2}, N_{2}$

Q. If

H_{2}

, He,

O_{2}

N_{2}

travel with same velocity then the longest de-Broglie wavelength should be associated with:

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