Advertisements
Advertisements
प्रश्न
Mention two cases in which there is no Doppler effect in sound?
Advertisements
उत्तर
- When source (S) and listener (L) both are at rest.
- When S and L move in such a way that distance between them remains constant.
- When source S and L are moving in mutually perpendicular directions.
- If the source is situated at the centre of the circle along which the listener is moving.
APPEARS IN
संबंधित प्रश्न
Which wave property determines (a) loudness, (b) pitch?
Why are musical instruments provided with more than one string ?
The speed of sound in air at 0°C is nearly :
Sound is generated by the rhythmic ______ of an object.
Draw a displacement-time graph for water wave.
A person hearing at one end of a long metal bar hears two distinct sounds when the other end is struck with a stone. Explain, giving scientific reasons
Match the following.
| Ultrasonics | Frequency below 20Hz |
| Speed of sound in air | Needs material medium |
| Infrasonics | 330ms-1 |
| Sound propagation | Frequency more than 20000 Hz |
Give an example to show that light travels faster than sound?
Sound can travel through solids, gases, liquids, and even vacuum.
Lightning can be seen the moment it occurs. Paheli observes lightning in her area. She hears the sound 5 s after she observed lightning. How far is she from the place where lightning occurs? (speed of sound = 330 m/s).
