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प्रश्न
Define the term Frequency (as applied to sound waves)
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उत्तर
The number of vibrations per second taken by a wave is called its frequency.
संबंधित प्रश्न
How is the frequency of a stretched string related it’s tension?
A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.
1) Calculate the speed with which this sound travels
2) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m?
State the use of echo by a bat, dolphin and fisherman.
Name the waves which are used in sonar to find the depth of a sea. Give one reason for their use.
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
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?
Name the type of waves that are used for sound ranging. Why are radio waves not audible to us?
Explain reflection at the boundary of a rarer medium.
Match the following:
| 1. | Stethoscope | a. | Repeated reflections |
| 2. | Echogram | b. | Multiple reflections |
| 3. | SONAR | c. | Ultrasonic waves |
| 4. | Reverberation | d. | Speed of underwater objects |
