Advertisements
Advertisements
प्रश्न
Advertisements
उत्तर
| Electromagnetic waves | Mechanical waves |
| 1. They can travel in vacuum. | 1. They cannot travel in vacuum. They need a materia I medium for their propagation. |
| 2. These are formed by the periodic vibrations of mutually perpendicular electric and magnetic field in a plane normal to the direction of wave propagation. | 2. These are formed by the vibrations of the medium particles about their mean positions. These vibrations can be along the direction of propagation of wave or perpendicular to it.. |
| 3. These are traverse in nature. | 3. These waves can be transverse as well as IonqitudnaI. |
APPEARS IN
संबंधित प्रश्न
The displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.
Study the two sound waves and compare their:
- Amplitudes
- Wavelengths
The following diagram shows three ways in which the string of an instrument can vibrate.
(a) which of the diagram shows the principal note?
(b) which has the frequency four times that of the first?
(c) what is the ratio of the frequency of the vibration in (i) and (ii)?
What is the shape of a soundboard kept behind the speaker on the stage of a big hall ?
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
Write the approximate value of the speed of sound in water.
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
What are fishing boats?
