- 1(current)
Q. No.Two sources of sound placed close to each other, are emitting progressive waves given by,
\(y_1=4\sin 600\pi t\) and \(y_2=5\sin 608\pi t\).
An observer located near these two sources of sound will hear:
| 1. | \(4\) beats per second with intensity ratio \(25:16\) between waxing and waning |
| 2. | \(8\) beats per second with intensity ratio \(25:16\) between waxing and waning |
| 3. | \(8\) beats per second with intensity ratio \(81:1\) between waxing and waning |
| 4. | \(4\) beats per second with intensity ratio \(81:1\) between waxing and waning |
1. \(253~\text{Hz}\)
2. \(262~\text{Hz}\)
3. \(250~\text{Hz}\)
4. \(259~\text{Hz}\)
| 1. | \(6\) | 2. | \(5\) |
| 3. | \(4\) | 4. | \(3\) |
In a guitar, two strings \(A\) and \(B\) made of same material are slightly out of tune and produce beats of frequency \(6~\text{Hz}\). When tension in \(B\) is slightly decreased, the beat frequency increases to \(7~\text{Hz}\). If the frequency of \(A\) is \(530~\text{Hz}\), the original frequency of \(B\) will be:
| 1. | \(524~\text{Hz}\) | 2. | \(536~\text{Hz}\) |
| 3. | \(537~\text{Hz}\) | 4. | \(523~\text{Hz}\) |
Three sound waves of equal amplitudes have frequencies of \((n-1),~n,\) and \((n+1).\) They superimpose to give beats. The number of beats produced per second will be:
| 1. | \(1\) | 2. | \(4\) |
| 3. | \(3\) | 4. | \(2\) |
1. \(210~\text{Hz}\)
2. \(209~\text{Hz}\)
3. \(191~\text{Hz}\)
4. \(190~\text{Hz}\)
Two identical wires are stretched by the same tension \(100\) N and each emits a node of frequency \(200\) Hz. If the tension in one wire is increased by \(1\) N, then the beat frequency is:
1. \(2\) Hz
2. \(\dfrac12\) Hz
3. \(1\) Hz
4. none of these
The phenomenon of beats can take place:
| 1. | for longitudinal waves only. |
| 2. | for transverse waves only. |
| 3. | for both longitudinal and transverse waves. |
| 4. | for sound waves only. |
- 1(current)
Q. No.
© 2025 GoodEd Technologies Pvt. Ltd.