If the length of a closed organ pipe is 1.5 m and the velocity of sound is 330 m/s, then the frequency for the second note is

(1) 220 Hz

(2) 165 Hz

(3) 110 Hz

(4) 55 Hz

Concept Questions :-

Standing waves
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A pipe 30 cm long is open at both ends. Which harmonic mode of the pipe is resonantly excited by a 1.1 kHz source? (Take the speed of sound in air = 330 ms–1

(1) First

(2) Second

(3) Third

(4) Fourth

Concept Questions :-

Standing waves
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A source of sound placed at the open end of a resonance column sends an acoustic wave of pressure amplitude ρ0 inside the tube. If the atmospheric pressure is ρA , then the ratio of maximum and minimum pressure at the closed end of the tube will be :

1. (ρA+ρ0)(ρAρ0)

2. (ρA+2ρ0)(ρA2ρ0)

3. ρAρA

4. ρA+12ρ0ρA-12ρ0

Concept Questions :-

Standing waves
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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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