The minimum audible wavelength at room temperature is about

1. 0.2 Å

2. 5 Å

3 5 cm to 2 metre

4. 20 mm

Subtopic:  Speed of Sound |
From NCERT
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The ratio of the speed of sound in nitrogen gas to that in helium gas, at 300 K is 

1.  2/7

2.  1/7

3.  3/5

4.  6/5

Subtopic:  Speed of Sound |
 51%
From NCERT
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The frequency of a rod is 200 Hz. If the velocity of sound in air is 340 ms–1, the wavelength of the sound produced is :

1. 1.7 cm

2. 6.8 cm

3. 1.7 m

4. 6.8 m

Subtopic:  Speed of Sound |
 83%
From NCERT
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A stone is dropped into a lake from a tower 500 metre high. The sound of the splash will be heard by the man approximately after 

[Given : Speed of sound = 340 m/s ]

1. 11.5 seconds

2. 21 seconds

3. 10 seconds

4. 14 seconds

Subtopic:  Energy of Waves |
 64%
From NCERT
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When sound waves travel from air to water, which of the following remains constant 

1. Velocity

2. Frequency

3. Wavelength

4. All the above

Subtopic:  Speed of Sound |
 90%
From NCERT
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At what temperature velocity of sound is double than that of at 0°C 

1. 819 K

2. 819°C

3. 600°C

4. 600 K

Subtopic:  Speed of Sound |
 77%
From NCERT
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If velocity of sound in a gas is 360 m/s and the distance between a compression and the nearest rarefaction is 1m, then the frequency of sound is 

1. 90 Hz

2. 180 Hz

3. 360 Hz

4. 720 Hz

Subtopic:  Speed of Sound |
 51%
From NCERT
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If the density of oxygen is 16 times that of hydrogen, what will be the ratio of their corresponding velocities of sound waves :

1. 1 : 4

2. 4 : 1

3. 16 : 1

4. 1 : 16

Subtopic:  Speed of Sound |
 75%
From NCERT
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At which temperature the speed of sound in hydrogen will be the same as that of the speed of sound in oxygen at 100°C :

1. – 148°C

2. – 212.5°C

3. – 317.5°C

4. – 249.7°C

Subtopic:  Speed of Sound |
 70%
From NCERT
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The phase difference between two points separated by 1m in a wave of frequency 120 Hz is 90°. The wave velocity is :

1. 180 m/s

2. 240 m/s

3. 480 m/s

4. 720 m/s

Subtopic:  Wave Motion |
 76%
From NCERT
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