Advertisements
Advertisements
प्रश्न
What are mechanical waves?
Advertisements
उत्तर
Mechanical waves are those that result from the mutual exchange of kinetic and potential energy between mediums of particle vibrations.
APPEARS IN
संबंधित प्रश्न
How do bats avoid obstacles in their way, when in flight?
What is a megaphone ? Name the principle on which a megaphone works.
What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
Explain how is the principle of echo used by
(a) The bat during its flight at night,
(b) The dolphin to locate small fish as its prey.
Waves produced on the surface of the water are formed to move with a velocity of 24 ms−1. If the wavelength of these waves equals 20 cm. find the
(i) frequency (no. of waves produced per second)
(ii) the time period (i.e. the time required to produce one wave) for these waves.
Explain why, the ceilings of concert halls are curved.
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 |
The direction of the incident sound, the direction of reflected sound, and the normal are in different Planes.
