Two closed pipe produce 10 beats per second when emitting their fundamental nodes. If their length are in ratio of 25 : 26. Then their fundamental frequency in Hz, are :

(1) 270, 280

(2) 260, 270

(3) 260, 250

(4) 260, 280

Concept Questions :-

Standing waves
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If v is the speed of sound in the air then the shortest length of the closed pipe which resonates to a frequency n :

(1) v4n

(2) v2n

(3) 2nv

(4) 4nv

Concept Questions :-

Standing waves
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The frequency of fundamental tone in an open organ pipe of length 0.48 m is 320 Hz. The speed of sound is 320 m/sec. Frequency of fundamental tone in closed organ pipe will be : 

(1) 153.8 Hz

(2) 160.0 Hz

(3) 320.0 Hz

(4) 143.2 Hz

Concept Questions :-

Standing waves
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What is the minimum length of a tube, open at both ends, that resonates with tuning fork of frequency 350 Hz? [velocity of sound in air = 350 m/s] 

(1) 50 cm

(2) 100 cm

(3) 75 cm

(4) 25 cm

Concept Questions :-

Standing waves
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The harmonics which are present in a pipe open at one end are :

(1) Odd harmonics

(2) Even harmonics

(3) Even as well as odd harmonics

(4) None of these

Concept Questions :-

Doppler effect
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The stationary wave y=2asinkxcosωt in a closed organ pipe is the result of the superposition of y=asin(ωtkx) and

(1) y=acos(ωt+kx)

(2) y=asin(ωt+kx)

(3) y=asin(ωt+kx)

(4) y=acos(ωt+kx)

Concept Questions :-

Standing waves
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An open pipe of length l vibrates in the fundamental mode. The pressure variation is maximum at :

(1) 1/4 from ends

(2) The middle of the pipe

(3) The ends of the pipe

(4) At 1/8 from ends of pipe middle of the pipe

Concept Questions :-

Standing waves
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The fundamental frequency of pipe is 100 Hz and the other two frequencies are 300 Hz and 500 Hz then :

(1) The pipe is open at both the ends

(2) The pipe is closed at both the ends

(3) One end open and another end is closed

(4) None of the above

Concept Questions :-

Standing waves
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The fundamental frequency of an open pipe of length 0.5 m is equal to the frequency of the first overtone of a closed pipe of length l. The value of lc is (m) :

(1) 1.5

(2) 0.75

(3) 2

(4) 1

Concept Questions :-

Standing waves
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In a closed organ pipe, the frequency of the fundamental note is 50 Hz. The note of which of the following frequencies will not be emitted by it :

(1) 50 Hz

(2) 100 Hz

(3) 150 Hz

(4) None of the above

Concept Questions :-

Standing waves
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