How many degrees of freedom the gas molecules have if, under $$\text{STP}$$, the gas density $$\rho = 1.3~\text{kg/m}^3$$ and the velocity of sound propagation in it is $$330~\text{ms}^{-1}$$${}^{}$?
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.

2.

3.

4.

Subtopic:  Types of Waves |
82%
From NCERT
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The phase difference between the prongs of a tuning fork is :

1.

2.

3.

4.  $5\mathrm{\pi }$

Subtopic:  Standing Waves |
53%
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The isothermal elasticity of a medium is ${\mathrm{E}}_{\mathrm{i}}$ and the adiabatic elasticity in ${\mathrm{E}}_{\mathrm{a}}$. The velocity of sound in the medium is proportional to

1.

2.

3.

4.  $\sqrt{{\mathrm{E}}_{\mathrm{a}}}$

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.

3.

4.  $3\mathrm{\pi }$

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) |
68%
From NCERT
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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 $y=\frac{30}{2+{\left(x-20t\right)}^{2}}$, 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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