Advertisements
Advertisements
Question
Name two sound absorbing materials (or objects) which can make our big room less echoey.
Advertisements
Solution
Curtains and carpets are two sound-absorbing materials that can make big rooms less echoey.
APPEARS IN
RELATED QUESTIONS
A wire of length 80 cm has a frequency of 256 Hz. Calculate the length of a similar wire under similar tension, which will have frequency 1024 Hz
Name the waves which are used in sonar to find the depth of a sea. Give one reason for their use.
What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?
What are mechanical waves?
Define the term Frequency (as applied to sound waves)
What are fishing boats?
(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?
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 |
