Question

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According to the Doppler effect, what appears to happen when a light source moves closer to an observer?


The waves stretch and frequency appears to increase.


The waves stretch and frequency appears to decrease.


The electromagnetic waves appear more blue in color.


The electromagnetic waves appear more red in color.

Answer 1

c. is the correct answer

.

Answer 2

The electromagnetic waves appear more blue in color.

Step-by-step explanation:

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.