MEDIUM
JEE Main
IMPORTANT
Earn 100

Figure shows two coherent sources S1 and S2 which emit sound of wavelength λ in phase. The separation between the sources is 3λ. A circular wire of large radius is placed in such a way that S1S2 lies in its plane and the middle point of S1S2 is at the centre of the wire. Find the angular positions θ on the wire for which constructive interference takes place.

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Important Questions on Sound Waves

EASY
JEE Main
IMPORTANT

Two sources of sound S1 and S2 vibrate at same frequency and are in phase. The intensity of sound detected at a point P, as shown in the figure, is I0.

(a) If θ equals 45°, what will be the intensity of sound detected at this point, if one of the sources is switched off?

(b) What will be the answer of the previous part, if θ=60°?

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EASY
JEE Main
IMPORTANT
Find the fundamental first overtone and second overtone frequencies of an open organ pipe of length 20 cm. The speed of sound in air is 340 m s-1.
MEDIUM
JEE Main
IMPORTANT
A closed organ pipe can vibrate at a minimum frequency of 500 Hz. Find the length of the tube. The speed of sound in air =340 ms-1.
EASY
JEE Main
IMPORTANT
In a standing wave pattern in a vibrating air column, nodes are formed at a separation of 4.0 cm. If the speed of sound in air is 328 ms-1, what is the frequency of the source?
EASY
JEE Main
IMPORTANT
The separation between a node and the next antinode in a vibrating air column is 25 cm. If the speed of sound in air is 340 ms-1, find the frequency of vibration of the air column.
EASY
JEE Main
IMPORTANT
A cylindrical metal tube has a length of 50 cm and is open at both ends. Find the frequencies between 1000 Hz and 2000 Hz at which the air column in the tube can resonate. The speed of sound in air is 340 m s-1.
MEDIUM
JEE Main
IMPORTANT

In a resonance column experiment, a tuning fork of frequency 400 Hz is used. The first resonance is observed when the air column has a length of 20.0 cm and the second resonance is observed when the air column has a length of 62.0 cm.

(a) Find the speed of sound in air.
(b) How much distance above the open end does the pressure node form?

EASY
JEE Main
IMPORTANT
The first overtone frequency of a closed organ pipe P1 is equal to the fundamental frequency of an open organ pipe P2. If the length of pipe P1 is 30 cm, what will be the length of P2?