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The speed of sound in oxygen at S.T.P. will be approximately: (given, R=8.3 J mol-1 K-1, =1.4)
(4) 315 m/s
Laplace formula: v= RTM; at STP T=273 K, MO2=32 10-3 kg mol-1
v= 1.4 8.3 27332 10-3
= 9.91 104 315 m/s
Answer: (4)
In a closed organ pipe, the frequency of fundamental note is 30 Hz. A certain amount of water is now poured in the organ pipe so that the fundamental frequency is increased to 110 Hz. If the organ pipe has a cross-sectional area of 2 cm2, the amount of water poured in the organ tube is g. (Take speed of sound in air is 330 m/s)
A point source is emitting sound waves of intensity 16 10-8 W m-2 at the origin. The difference in intensity (magnitude only) at two points located at distances of 2 m and 4 m from the origin respectively will be 10-8 W m-2.
A closed organ pipe 150 cm long gives 7 beats per second with an open organ pipe of length 350 cm, both vibrating in fundamental mode. The velocity of sound is m/s.