Advertisements
Advertisements
Question
What is the condition necessary for an echo to be heard distinctly?
Advertisements
Solution
Echo is a reflected sound heard after the original sound strikes a rigid obstacle...
The conditions are-
1- The reflecting surface should have a larger reflecting surface than the wavelength of the sound
2- The minimum distance to hear the echo should be 17m in the air or as described by the formula `(Vt)/2`...
RELATED QUESTIONS
Name the principle on which a soundboard works.
Mention two properties of a wave, one property which varies and the other which remains constant when the wave passes from one medium to another.
A cork piece is floating on the surface of the water in a pond. A piece of pebble is dropped into the water. What will be your observation?
A type of electromagnetic wave has a wavelength of 50 Å. Name the wave and state one use of this type of wave.
Explain why, the ceilings of concert halls are curved.
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.
