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

Concept Questions :-

Speed of sound
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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

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The echo of a gunshot is heard 8 sec. after the gun is fired. How far from him is the surface that reflects the sound? (velocity of sound in air = 350 m/s) :

(1) 1400 m

(2) 2800 m

(3) 700 m

(4) 350 m

Concept Questions :-

Speed of sound
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A man sets his watch by the sound of a siren placed at a distance 1 km away. If the velocity of sound is 330 m/s

(1) His watch is set 3 sec. faster

(2) His watch is set 3 sec. slower

(3) His watch is set correctly

(4) None of the above

Concept Questions :-

Speed of sound
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Velocity of sound in air is

(1) Faster in dry air than in moist air

(2) Directly proportional to pressure

(3) Directly proportional to temperature

(4) Independent of pressure of air

Concept Questions :-

Speed of sound
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The frequency of a sound wave is n and its velocity is v. If the frequency is increased to 4n, the velocity of the wave will be 

(1) v

(2) 2v

(3) 4v

(4) v/4

Concept Questions :-

Speed of sound
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The speed of a wave in a certain medium is 960 m/s. If 3600 waves pass over a certain point of the medium in 1 minute, the wavelength is :

(1) 2 metres

(2) 4 metres

(3) 8 metres

(4) 16 metres

Concept Questions :-

Speed of sound
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Speed of sound at constant temperature depends on :

(1) Pressure

(2) Density of gas

(3) Above both

(4) None of the above

Concept Questions :-

Speed of sound
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Sound velocity is maximum in :

(1) H2

(2) N2

(3) He

(4) O2

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The minimum distance of reflector surface from the source for listening the echo of sound is :

(1) 28 m

(2) 18 m

(3) 19 m

(4) 16.5 m

Concept Questions :-

pressure wave in sound
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