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 X-axis. The particles of the medium
(a) must move on the X-axis
(b) must move on the Y-axis
(c) may move on the X-axis
(d) may move on the Y-axis
Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. All of these
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
A wave going in a solid,
a. | must be longitudinal |
b. | may be longitudinal |
c. | must be transverse |
d. | may be transverse |
Choose the correct option:
1. | (a) and (b) |
2. | (b) and (d) |
3. | (b) and (c) |
4. | (a) and (d) |