14. Match the following.
Ultrasonics - Frequency below 20Hz
Speed of sound in air - Needs material medium
Infrasonics - 330ms-1
Sound propagation - Frequency more than 20000 Hz
15. Give an example to show that light travels faster than sound?
16. Give two differences between music and noise.
17. Mention few measures to be taken to reduce the effect of noise pollution.
IV. ANSWER IN DETAIL (Any 1): 1×5=5
18. What steps should be taken to reduce the effect of noise pollution?
19. Describe an experiment to show that sound cannot travel through vaccum.
Answers
Answer:
1. infrasonic
2. 760mph
Answer:
15.You see the lightning first and then hear the thunder. The most common example of showing that light travels faster than sound is lightning. ... This is because light travels with a speed of approximately in air whereas sound travels at a speed of in the same.
16.Noise is sound with a continuous structure. Music is composed of sounds with a fundamental frequency and overtones. Noise is composed of sounds with frequencies that range continuously in value from as low as you can hear to as high as you can hear — not necessarily at equal intensity, however.
17. Noise is sound with a continuous structure.Music is composed of sounds with a fundamental frequency and overtones. Noise is composed of sounds with frequencies that range continuously in value from as low as you can hear to as high as you can hear — not necessarily at equal intensity, however.
18. Turn off Appliances at Home and offices. ...
Shut the Door when using noisy Machines. ...
Use Earplugs. ...
Lower the volume. ...
Stay away from Noisy area. ...
Follow the Limits of Noise level. ...
Control Noise level near sensitive areas. ...
Go Green by planning trees.
19. The experiment is done by placing an electrical bell in the bell jar. As the air is pumped out of the sealed bell jar, the sound from the bell jar fades. ... However, the sound is not audible to our ears because of the vacuum inside the jar. This demonstrates that the sound wave cannot travel through vacuum.
Explanation:
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