Advertisements
Advertisements
प्रश्न
Advertisements
उत्तर
The sound heard after reflection from a rigid obstacle (such as cliff, a hillside, a wall of a building, edge of a forest etc.), is called an echo.
Conditions necessary for echo formation are:
1. The minimum distance between the source of sound and its reflector should be 17 m.
2. Reflected sound should reach the person atleast 0.1 second after the original sound is heard.
APPEARS IN
संबंधित प्रश्न
What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
Define the term Frequency (as applied to sound waves)
Point out the waves from the given list, i.e., light, sound, radio waves, ultrasonic waves, and thermal radiation, the energy is propagated by mechanical waves.
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.
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
How are bats able to fly in the dark?
Draw a diagram representing a wave of amplitude 4 cm and wavelength 2 m. If the frequency of the wave is 150 Hz, calculate its velocity.
