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Q. No.A taut string, fixed at both ends, is allowed to vibrate in its fundamental mode with a maximum amplitude \(A.\) The total energy of vibration is proportional to:
| 1. | \(A\) | 2. | \(A^2\) |
| 3. | \(A^4\) | 4. | \(\dfrac{1}{A^2}\) |
Subtopic: Â Energy of Waves |
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Level 1: 80%+
Hints
A point source of sound is placed in a non-absorbing medium. Two points \(A\) and \(B\) are at a distance of \(2~\text m\) and \(3~\text m\) from the source, respectively. The ratio of the intensity of the wave at \(A\) to that at \(B\) is:
1. \(\sqrt 3:\sqrt 2\)
2. \(3:2\)
3. \(9:4\)
4. \(2:3\)
1. \(\sqrt 3:\sqrt 2\)
2. \(3:2\)
3. \(9:4\)
4. \(2:3\)
Subtopic: Â Energy of Waves |
 83%
Level 1: 80%+
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Hints
Please attempt this question first.
The intensity level of sound of intensity l is 20 dB. The ratio of \(I \over I_0\) is:
(I0 is the threshold of hearing)
1. 10
2. 20
3. 100
4. 1000
(I0 is the threshold of hearing)
1. 10
2. 20
3. 100
4. 1000
Subtopic: Â Energy of Waves |
 78%
Level 2: 60%+
Please attempt this question first.
Hints
- 1(current)
Q. No.
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