- 1(current)
Q. No.When two identical loudspeakers playing the same frequency are placed equidistant from an observer, a sound of \(60\) dB is heard if the sources are in phase with each other. However, if the two speakers are out of phase, no sound is heard. If the speakers are played with a phase difference of \(90^\circ,\) the sound heard will be:
1. \(30\sqrt2\) dB
2. \((60+\sqrt2)\) dB
3. \(57\) dB
4. \(60\sqrt2\) dB
1. \(30\sqrt2\) dB
2. \((60+\sqrt2)\) dB
3. \(57\) dB
4. \(60\sqrt2\) dB
Subtopic: Â Pressure Wave in Sound |
From NCERT
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When sound waves of the same frequency and amplitude travel in opposite directions, and interfere, standing waves are formed. At the location of a displacement node, pressure variations:
| 1. | are maximum |
| 2. | are zero |
| 3. | are between zero and maximum |
| 4. | are infinite |
Subtopic: Â Pressure Wave in Sound |
 62%
From NCERT
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The air in an organ pipe \((AB)\) is set into vibration as it is played. The pressure amplitude of vibration of air in the pipe is:
| 1. | maximum at \(A\) and at \(B\) |
| 2. | minimum at \(A\) and at \(B\) |
| 3. | maximum at \(A\) and minimum at \(B\) |
| 4. | minimum at \(A\) and maximum at \(B\) |
Subtopic: Â Pressure Wave in Sound |
 64%
From NCERT
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If the pressure amplitude of a sound wave doubles, the intensity of the wave:
| 1. | doubles |
| 2. | increases to \(4\) times |
| 3. | halves |
| 4. | decreases by \(4\) times \(\large\Big(\)i.e., becomes \(\Large\frac14\)\(\large\Big)\) |
Subtopic: Â Pressure Wave in Sound |
 75%
From NCERT
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Q. No.
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