What is the wavelength in front of the source compared to the wavelength in back

Question

What is the wavelength in front of the source compared to the wavelength in back of the source? 5. 6. Red light has a wavelength of about 6x10 m, and blue light has a wavelength of about 5x10 m. If a source of green light is approaching you, will its wavelength be shifted toward the red or blue end of the spectrum? 7. A star burns hydrogen, which gives off 4 very distinct visible wavelengths of light. It is observed that all 4 wavelengths are equally longer than they should be. What does this tell us about the star?

Explanation / Answer

5. As long as source and observer are not moving the wavelength in front of the source and the wavelength in the back of the source will be same.

6. According to Doppler's effect if the source is approaching towards you then its wavelength is decreased and since the blue light has smaller wavelength than red light wavelength therefore if a green light is approaching towards you then it will be blue shifted. If I will have to draw an analogy, as a matter of fact, the Andromeda galaxy is approaching toward milky way galaxy, therefore, the light from Andromeda galaxy is blue shifted.

7. It is telling that star is moving away from us that is redshifted.

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