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प्रश्न
Name two sound absorbing materials (or objects) which can make our big room less echoey.
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उत्तर
Curtains and carpets are two sound-absorbing materials that can make big rooms less echoey.
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संबंधित प्रश्न
A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which changes.
State the use of echo by a bat, dolphin and fisherman.
Name the waves which are used in sonar to find the depth of a sea. Give one reason for their use.
The following diagram shows three ways in which the string of an instrument can vibrate.
(a) which of the diagram shows the principal note?
(b) which has the frequency four times that of the first?
(c) what is the ratio of the frequency of the vibration in (i) and (ii)?
What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
What are mechanical waves?
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.
What is meant by an echo? Explain.
