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Iteru [2.4K]
4 years ago
12

If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to have

Biology
2 answers:
Hoochie [10]4 years ago
3 0
Increased in pitch (frequency). It's the doppler effect.
Lena [83]4 years ago
3 0

Answer choices are:

a. a period higher than the original period.

b. a pitch lower than the original pitch.

c. an amplitude lower than the original amplitude.

d. a frequency higher than the original frequency.

____________________________________________________________

Correct answer choice is:

D. A frequency higher than the original frequency.

____________________________________________________________

Explanation:

This is a true case of Doppler's effect. The Doppler effect can be defined as the effect originated by a traveling source of waves in which there is a visible higher variation in pulse for observers towards what the source is progressing and a visible descending shift in rate for observers from what the source is dropping.


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Which of the following correctly sorts the organizational levels of a ecosystem form least inclusive to most inclusive
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Answer:

population - community - ecosystem - biosphere

Explanation:

<em>The correctly sorted level of organization of an ecosystem from the least inclusive to the most inclusive would be from population to community to ecosystem and finally to biosphere.</em>

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4 years ago
---------------- is the finest material can be blasted more than 20 kilometers into the atmosphere and carried much farther down
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Pyroclastic flow, in a volcanic eruption, a fluidized mixture of hot rock fragments, hot gases, and entrapped air that moves at high speed in thick, gray-to-black, turbulent clouds that hug the ground. The temperature of the volcanic gases can reach about 600 to 700 °C (1,100 to 1,300 °F). The velocity of a flow often exceeds 100 km (60 miles) per hour and may attain speeds as great as 160 km (100 miles) per hour.

To learn more about Pyroclastic materials here

brainly.com/question/16582896

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