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Chapter 2: Q19DQ (page 538)

Can you think of circumstances in which a Doppler effect would be observed for surface waves in water? For elastic waves propagating in a body of water deep below the surface? If so, describe the circumstances and explain your reasoning. If not, explain why not

Short Answer

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The velocity of the source of light can be calculated by taking the difference between the frequency from each side of the star. In this way, the velocity of rotation of the star can be easily calculated.

Step by step solution

01

Concept of the Doppler effect

A Doppler effect is seen in sound as well as in light. So, during the rotation of the stars one part of the star moves towards the observer and another part of the star moves away from the observer. Thus, the light which is moving away from the observer has a lower frequency and the light which is moving toward the observer has a higher frequency. The light with a lower frequency is known as “Red Shifted” because it has a high wavelength which makes it look red.

The velocity of the source of light can be calculated by taking the difference between the frequency from each side of the star. In this way, the velocity of rotation of the star can be easily calculated.

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