Wave Motion and Sound
Wave Motion and Sound
Wave motion is nothing but a mode of transfer of energy from place to place without material support. The most common medium through which sound travels is air.
Formation of Compression and Rarefaction in Air: When a vibrating object moves forward in air, it pushes and compresses the air in front of it, creating a compression which starts to move away from the vibrating object. When the vibrating object moves backwards, it creates rarefaction. Compression is the part of a longitudinal wave in which the particles of the medium are closer to one another than they normally are and it is the region of high pressure. It is denoted by C. Rarefaction is the part of a longitudinal wave in which the particles of the medium are farther apart than they normally are and it is the region of low pressure. It is denoted by R. As the object moves back and forth rapidly, a series of compressions and rarefactions is created in air.
A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case | |||
| Right Option : A | |||
| View Explanation |
______________________ is the part of a longitudinal wave in which the particles of the medium are farther apart than they normally are and it is the region of low pressure. | |||
| Right Option : B | |||
| View Explanation | |||
The speed of sound of a wave of frequency 200 Hz in air is 340 m/s. The speed of sound of wave of frequency 400 Hz in same air is _________________ | |||
| Right Option : A | |||
| View Explanation | |||
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