How many degrees of freedom the gas molecules have if, under STP, the gas density ρ=1.3 kg/m3 and the velocity of sound propagation in it is 330 ms-1?

1. 3       

2. 5         

3. 7             

4. 8

Subtopic:  Speed of Sound |
 67%
From NCERT
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Equation of the wave is given by y = 0.4 sin(314t - 3.14x), where x and y are in meter and t is in second. The speed of the wave is :

1.  50 m/s

2.  100 m/s

3.  314 m/s

4.  3.14 m/s

Subtopic:  Wave Motion |
 71%
From NCERT
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A plane progressive wave cannot be represented by

1.  y = a sin ωt ± kx  

2.  y = a sin 2πtT xλ  

3.  y = a sin 2πλ Vt  x  

4.  y = A log x + B log x

Subtopic:  Types of Waves |
 83%
From NCERT
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The phase difference between the prongs of a tuning fork is :

1.  2π  

2.  3π  

3.  π  

4.  5π

Subtopic:  Standing Waves |
 52%
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The isothermal elasticity of a medium is Ei and the adiabatic elasticity in Ea. The velocity of sound in the medium is proportional to

1.  Ei  

2.  Ea 

3.  Ei  

4.  Ea

Subtopic:  Speed of Sound |
 60%
From NCERT
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When a wave is reflected from a denser medium the change in phase is :

1.  0

2.  π 

3.  2π 

4.  3π

Subtopic:  Wave Motion |
 72%
From NCERT
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In a stationary wave along a string, the strain is:

1.  zero at the antinodes

2.  maximum at the antinodes

3.  zero at the nodes

4.  maximum at the nodes

Subtopic:  Standing Waves |
From NCERT
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A source of sound moves away with the velocity of sound from a stationary observer. The frequency of the sound heard by the observer:

1. remains the same

2. is doubled

3. is halved

4. becomes infinity
 

Subtopic:  Doppler's Effect (OLD NCERT) |
 69%
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The longitudinal waves can travel :

1.  only in liquids

2.  only in solids

3.  only in gases

4.  In liquids, solids, and gases

Subtopic:  Types of Waves |
 81%
From NCERT
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The equation of a wave pulse travelling along x-axis is given by y=302+x-20t2, x and y are in meters and t is in seconds. The amplitude of the wave pulse is 

1.  5 m

2.  20 m

3.  15 m

4.  30 m

Subtopic:  Wave Motion |
 54%
From NCERT
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