# WAVES online Test

If the velocity of sound in air is 336 m/s. The maximum length of a closed pipe that would produce a just audible sound is ____.
3.2 cm
4.2 m
4.2 cm
3.2 m
An organ pipe  closed at one end vibrating in its first overtone and another pipe  open at both ends vibrating in its third overtone are in resonance with a given tuning fork. The ratio of lengths of  and  is ____.
1 : 2
1 : 3
3 : 8
3 : 4
A resonance air column of length 20 cm resonates with a tuning fork of frequency 250 Hz. The speed of sound in air is ____.
300 m/s
200 m/s
150 m/s
75 m/s
A cylindrical tube, open at both ends, has a fundamental frequency  in air. The tube is dipped vertically into water such that half of its length is inside water. The fundamental frequency of the air column now is ____.
Two closed organ pipes, when sounded simultaneously gave 4 beats per sec. If longer pipe has a length of 1m. Then length of shorter pipe is, (v = 300 m/s) ____.
185.5 cm
94.9 cm
90 cm
80 cm
A source of sound placed at the open end of a resonance column sends an acoustic wave of pressure amplitude  inside the tube. If the atmospheric pressure is  then the ratio of maximum and minimum pressure at the closed end of the tube is ____.
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 ____.
270, 280
260, 270
260, 250
260, 280
A closed organ pipe and an open organ pipe are tuned to the same fundamental frequency. What is the ratio of lengths?
1 : 2
2 : 1
2 : 3
4 : 3
Find the fundamental frequency of a closed pipe, if the length of the air column is 42 m. (speed of sound in air = 332 m/s) ____.
2 Hz
4 Hz
7 Hz
9 Hz
If v is the speed of sound in air then the shortest length of the closed pipe which resonates to a frequency n ____.
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