cynthiauzoma367
17.07.2019 •
Biology
25 points someone ! explain how to frequency of sound changes as an ambulance approaches you and passes you by as you stand on a sidewalk.
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Ответ:
As the ambulance approaches you, the distance between the source of the waves and the observer decreases. Consequently, the siren sounds more shrill as the pitch of the wailing siren 'sounds' higher than its original value, as sound waves reach you 'more frequently'.
Explanation:
Ответ:
Animals and plants need to get rid of carbon dioxide gas through a process called respiration. Carbon moves from fossil fuels to the atmosphere when fuels are burned. When humans burn fossil fuels to power factories, power plants, cars and trucks, most of the carbon quickly enters the atmosphere as carbon dioxide gas.
Explanation: