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. |
Assertion (A): | Our ears distinguish two notes, one produced by a violin and other by guitar, if they have exactly same intensity and same frequency. |
Reason (R): | When a musical instrument is played, it produces a fundamental note which is accompanied by a number of overtones called harmonics. |
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 a stationary wave there is no transfer of energy. |
Reason (R): | The distance between two consecutive nodes or antinodes is \(\begin{aligned}\frac{\lambda}{\sqrt{2}} \end{aligned}\). |
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. |
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 |
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