Q 1.List three sounds produced in nature, and three sonunds produced by things made by humans
Q2.what kind of sound is annoying to hear
Q 3.What are warning sounds? How are they useful to us
Q 4.What is noise pollution? What kind of sounds produce noise pollution
Q 5.Suggest three methods of reducing noise pollution around us.
Answers
Answer:
1) Natural sounds are any sounds produced by non-human organisms as well as those generated by natural, non-biological sources within their normal soundscapes.
2) A study conducted by New Scientist found out that vuvuzelas are not only annoying but also very dangerous for hearing. Listening to the sound they produce from 1 meter exposes the ear to 116 decibels.
3) Electric vehicle warning sounds are sounds designed to alert pedestrians to the presence of electric drive vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and all-electric vehicles (EVs) travelling at low speeds. Warning sound devices were deemed necessary by some government regulators because vehicles operating in all-electric mode produce less noise than traditional combustion engine vehicles and can make it more difficult for pedestrians and cyclists (especially the blind or short-sighted) to be aware of their presence. Warning sounds may be driver triggered (as in a horn but less urgent) or automatic at low speeds; in type, they vary from clearly artificial (beeps, chimes) to those that mimic engine sounds and those of tires moving over gravel.
4) Noise pollution is generally defined as regular exposure to elevated sound levels that may lead to adverse effects in humans or other living organisms. According to the World Health Organization, sound levels less than 70 dB are not damaging to living organisms, regardless of how long or consistent the exposure is.
5) We can Reduce Noise pollution by turning off appliances when not in use, use of earplugs, lowering the volume, planting more trees, regular maintenance of vehicles and machines etc. By controlling noise we can control negative health effects that noise pollution has on everyone.
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