Two waves of equal amplitude A, and equal frequency travel in the same direction in a medium. The amplitude of the resultant wave is
1. 0
2. A
3. 2A
4. between 0 and 2A
Two sine waves travel in the same direction in a medium. The amplitude of each wave is \(A\) and the phase difference between the two waves is \(120^\circ.\) The resultant amplitude will be:
1. \(A\)
2. \(2A\)
3. \(4A\)
4. \(\sqrt2 A\)
The fundamental frequency of a string is proportional to:
1. | the inverse of its length | 2. | the diameter |
3. | the tension | 4. | the density |
A tuning fork of frequency 480 Hz is used to vibrate a sonometer wire having natural frequency 240 Hz. The wire will vibrate with a frequency of
1. 240 Hz
2. 480 Hz
3. 720 Hz
4. will not vibrate
A tuning fork of frequency \(480\) Hz is used to vibrate a sonometer wire having natural frequency \(410\) Hz. The wire will vibrate with a frequency:
1. | \(410\) Hz | 2. | \(480\) Hz |
3. | \(820\) Hz | 4. | \(960\) Hz |
A sonometer wire of length l vibrates in fundamental mode when excited by a tuning fork of frequency 416 Hz. If the length is doubled keeping other things same, the string will
1. vibrate with a frequency of 416 Hz
2. vibrate with a frequency of 208 Hz
3. vibrate with a frequency of 832 Hz
4. stop vibrating
A sonometer wire supports a 4 kg load and vibrates in fundamental mode with a tuning fork of frequency 416 Hz. The length of the wire between the bridges is now doubled. In order to maintain fundamental mode, the load should be changed to
1. 1 kg
2. 2 kg
3. 8 kg
4. 16 kg
A mechanical wave propagates in a medium along the \(\mathrm{X}\)-axis. The particles of the medium:
(a) | \(\mathrm{X}\)-axis | must move on the
(b) | \(\mathrm{Y}\)-axis | must move on the
(c) | \(\mathrm{X}\)-axis | may move on the
(d) | \(\mathrm{Y}\)-axis | may move on the
Choose the correct option from the given ones:
1. | (a) and (b) only |
2. | (b) and (c) only |
3. | (c) and (d) only |
4. | (a), (b), (c) and (d) |
A transverse wave travels along the Z-axis. The particles of the medium must move:
1. | along the Z-axis | 2. | along the X-axis |
3. | along the Y-axis | 4. | in the X-Y plane |
Longitudinal waves cannot
1. have a unique wavelength
2. transmit energy
3. have a unique wave velocity
4. be polarized