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Aleonysh [2.5K]
3 years ago
10

The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flo

w pattern, with crests and troughs that remain stationary although the air that forms them is moving rapidly, are known as "standing waves."
(A) crests and troughs that remain stationary although the air that forms them is moving rapidly, are

(B) crests and troughs that remain stationary although they are formed by rapidly moving air, are

(C) crests and troughs that remain stationary although the air that forms them is moving rapidly, is

(D) stationary crests and troughs although the air that forms them is moving rapidly, are

(E) stationary crests and troughs although they are formed by rapidly moving air, is
Geography
1 answer:
UkoKoshka [18]3 years ago
8 0

Answer:

A. Crests and troughs that remain stationary although the air forms them is moving rapidly.

Explanation:

The standing waves are a  phenomenon that is a result of the interference of two wavelengths. The air over the mountain ranges is of high intensity as a result of temperature elevation. Fast movements of air currents produce scrambled ripples, as a result, the pattern of air crest and troughs remains static.

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Given:

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Solution:

Let A be the event that the residents visit Comet Mall and B be the event that residents visit Star Mall. Then, we have

P(A)=62\%

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P(A\cap B)=48\%

We need to find the probability that a resident chosen at random shops at either Comet Mall or at Star Mall. It means, we have to find the value of P(A\cup B).

We know that,

P(A\cup B)=P(A)+P(B)-P(A\cap B)

On substituting the given values, we get

P(A\cup B)=62\%+73\%-48\%

P(A\cup B)=87\%

Therefore, the probability that a resident chosen at random shops at either Comet Mall or at Star Mall is 87%.

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