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प्रश्न
Name the device which is used to address a small gathering of people.
उत्तर
Megaphone or bullhorn is a device that is used to address a small gathering of people.
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संबंधित प्रश्न
Name three devices which work on the reflection of sound.
In which medium, air or water, an echo is heard much sooner ? Why ?
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.
What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ?
Name any two objects which are good reflectors of sound.
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.
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a furnished room
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 ?
What are the medical applications of echo?
Answer the following question in your own words.
What factors are important to get a distinct echo?
