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1) Frequency describes the rate in which waves move through a given location. In the simulation, the airplane emits waves as it travels. The closer together the waves appear, the higher their frequency appears.

Imagine you’re standing at the center of the simulation, and the airplane flies directly overhead with an object speed of 50 meters per second. From your perspective, how does the frequency of the waves appear to change as the airplane approaches and then passes you?

2) Determine how visible light is affected by changes in frequency.

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Answer:

When the airplane approaches, the waves appear closer together, indicating a higher frequency. As the airplane passes, the waves appear more spaced out, indicating a lower frequency.

Explanation:

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(a) Light source is moving towards the observer so the frequency will increase and wavelength will decrease

(b)The visible waves appear blue in colour.

What is the Dopplers effect?

Doppler's Effect: When a source moves with respect to the observer the frequency of the wave emitted from the source changes. If the source moves away from the observer, the frequency decreases and wavelength increases and vice versa.

Here the light source is moving towards the observer so the frequency will increase and wavelength will decrease. Thus the spectrum will shift towards the blue part. This is known as blue shift. The light wave will appear blue in color.

Hence

(a) Light source is moving towards the observer so the frequency will increase and wavelength will decrease

(b)The visible waves appear blue in colour.

To know more about the Dopplers effect follow

https://brainly.com/question/1330077