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प्रश्न
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
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उत्तर
The ceilings of the concert hall are made curved so that sound, after reflection from the ceiling, reaches all parts of the hall and the speech can be easily heard even by the person sitting at a considerable distance. The curved surface of the ceiling reflects the sound of the speaker toward the audience and hence prevents the spreading of sound in various directions. Due to this, sound is distributed uniformly throughout the hall and even the person sitting at the back of the hall can hear the speech easily.
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संबंधित प्रश्न
When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
The echo of a sound is heard after 5 seconds. If the speed of sound in air be 342 m/s, calculate the distance of the reflecting surface.
State the laws of reflection of sound.
What is an echo ? How is echo formed ?
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo ? Speed of sound in air is 330 m/s.
The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea by the echo method ?
Answer the following question in your own words.
What should be the dimensions and the shape of classrooms so that no echo can be produced there?
What is an echo?
______ is an image obtained by the use of reflected ultrasonic waves.
