Fill in the blanks:
1. Speed of sound in air depends on the ______ and _______ in air.
2. Speed of sound is least in _______ media.
3. Speed of sound in gas depends on its ______.
4. An object travelling with a speed greater than the speed of sound is said to be having ______ speed.
5. Speed of sound in water is _______.
6. Metallic sheets, plane polished smooth walls are _______ reflectors of sound.
7. To hear a clear echo ________ should be the distance between the source of sound and the reflecting surface.
8. Magaphones work on the principles of ________ of sound.
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Answers
Answer:
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Explanation:
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Answer:
Ans 1 )The speed of sound in air depends on the type of gas and the temperature of the gas. On Earth, the atmosphere is composed of mostly diatomic nitrogen and oxygen, and the temperature depends on the altitude in a rather complex way.
Ans 2 )In general, the bond strength between particles is strongest in solid materials and is weakest in the gaseous state. As a result, sound waves travel faster in solids than in liquids, and faster in liquids than in gasses.
Ans 4 )Supersonic speed is a rate of travel of an object that exceeds the Speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 C (68 F) at sea level, this speed is approximately 343.2 m/s, 1,125 ft/s, 768 mph, 667 knots, or 1,235 km/h.
Ans 5 )about 1481 m/s
Ans 6 )Metallic sheets, plane polished smooth walls are. of sound. 8. Sound cannot travel through. media. 9. To hear a clear echo. should be the distance between the source.
Ans 7 )The total distance between a sound source and the reflector is twice that. So, if the obstacle is at least 17 m away, then after 0.1 second, the reflected sound or the echo is clearly detected. Hence, to hear a clear echo, the minimum distance between the reflecting surface and the observer is 17 m.
Ans 8 )A megaphone works on the principle of multiple reflection of sound waves. We already know that a megaphone is in the shape of a funnel. As a result, when sound is produced in a megaphone, the waves are reflected multiple times and travel in a path leading to the opening of the funnel.
Ans 3 ) Speed of sound in a gas depends on the density and elasticity of the gas.