Advertisements
Advertisements
प्रश्न
Name two sound absorbing materials (or objects) which can make our big room less echoey.
Advertisements
उत्तर
Curtains and carpets are two sound-absorbing materials that can make big rooms less echoey.
APPEARS IN
संबंधित प्रश्न
The human ear can detect continuous sounds in the frequency range from 20 Hz to 20,000 Hz. Assuming that the speed of sound in air is 330 m s−1 for all frequencies, calculate the wavelengths corresponding to the given extreme frequencies of the audible range.
How is the frequency of a stretched string related it’s tension?
The displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.
Study the two sound waves and compare their:
- Amplitudes
- Wavelengths
What is the condition necessary for an echo to be heard distinctly?
What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?
What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
How are bats able to fly in the dark?
(i) A man stands at a distance of 68 m from a cliff and fires a gun. After what time interval will he hear the echo, if the speed of sound in air is 340 ms−1?
(ii) If the man had been standing at a distance of 12 m from the cliff would he have heard a clear echo?
Write short notes on reflection of sound waves from plane and curved surfaces.
