If the speed of sound in air is \(320\) m/s, then with what frequency of sound will an air column of \(2\) m long pipe closed at one end will resonate?
1. \(120\) Hz
2. \(200\) Hz
3. \(280\) Hz
4. All of these
The graph between fundamental frequency (\(f\)) and corresponding tension (\(T\)) in a sonometer wire is best-represented by:
1. | 2. | ||
3. | 4. |
A pipe, \(30.0\) cm long, is open at both ends.
(i) | Which harmonic mode of the pipe resonates a \(1.1\) kHz source? |
(ii) | Will resonance with the same source be observed if one end of the pipe is closed? |
Take the speed of sound in air as \(330\) m s–1.
(i) | (ii) | |
1. | First | No |
2. | Second | No |
3. | First | Yes |
4. | Second | Yes |
Assertion (A): | Sound waves in a gas are pressure waves, but these are also accompanied by changes in local temperature. |
Reason (R): | This is due to the fact that sound waves are propagated in gas through an adiabatic process, and hence accompanied by temperature variations. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
The figure shows the snapshot of a travelling sine wave in a string. Four elemental portions \(a,b,c\) and \(d\) are indicated on the string. The elemental portion with maximum potential energy is/are:
1. \(a\)
2. \(b\)
3. \(c\)
4. \(b \text{ and } d\)
Assertion (A): | Sound would travel faster on a hot summer day than on a cold winter day. |
Reason (R): | Velocity of sound is directly proportional to the square root of its absolute temperature. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Assertion (A): | Where two vibrating tuning forks having frequencies \(256~\text{Hz}\) and \(512~\text{Hz}\) are held near each other, beats cannot be heard. |
Reason (R): | The principle of superposition is valid only if the frequencies of the oscillators are nearly equal. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Assertion (A): | Beats can also be observed by two light sources as in sound. |
Reason (R): | Light sources have constant phase difference. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | In the case of a stationary wave, a person hears a loud sound at the nodes as compared to the antinodes. |
Reason (R): | In a stationary wave, all the particles of the medium vibrate in phase. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Statement I: | Sound waves travelling from air into water, incident obliquely, bend towards the normal. |
Statement II: | Sound waves travel more slowly in water than in air. |
1. | Statement I is incorrect and Statement II is correct. |
2. | Both Statement I and Statement II are correct. |
3. | Both Statement I and Statement II are incorrect. |
4. | Statement I is correct and Statement II is incorrect. |