Q. No.Which one of the following statements is true?
| 1. | Both light and sound waves in the air are transverse. |
| 2. | The sound waves in the air are longitudinal while the light waves are transverse. |
| 3. | Both light and sound waves in the air are longitudinal. |
| 4. | Both light and sound waves can travel in a vacuum. |
Which of the following is a mechanical wave?
1. Radio waves
2. X-rays
3. Light waves
4. Sound waves
Velocity of sound in air is \(332\) m/s. Its velocity in the vacuum will be:
1. \(>332\) m/s
2. \(=332\) m/s
3. \(<332\) m/s
4. meaningless
A wave moving in a gas:
| 1. | must be longitudinal |
| 2. | may be longitudinal |
| 3. | must be transverse |
| 4. | may be transverse |
is superposed with another waveform \(y=4Acos(\omega t-kx).\) The amplitude of the resulting waveform will be:
1. \(7A\)
2. \(A\)
3. \(3.5A\)
4. \(5A\)
1. \(20\) cm
2. \(30\) cm
3. \(40\) cm
4. \(80\) cm
1. \(A\)
2. \(\sqrt 2A\)
3. \(2A\)
4. \((2+\sqrt2)A\)
Two waves are represented by the equations and
,
where \(x\) is in metres and \(t\) in seconds. The phase difference between them is:
1. \(1.25\) rad
2. \(1.57\) rad
3. \(0.57\) rad
4. \(1.0\) rad
1. \(1:2\)
2. \(1:1\)
3. \(\sqrt{2}:1\)
4. \(1:\sqrt{2}\)
A rope of uniform mass per unit length \(\mu\) is suspended from the ceiling, hanging under its own weight. If a small transverse pulse is formed at its lower end A, it travels upward with a local speed \(v=\sqrt{\frac{tension}{mass/length}}\).
The speed of the pulse is:
| 1. | maximum at A, minimum at O |
| 2. | minimum at A, maximum at O |
| 3. | uniform |
| 4. | minimum at A and O, maximum in the middle |
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