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Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly.
If a distant galaxy has a substantial redshift (as viewed from Earth), then anyone living in that galaxy would see a substantial redshift in a spectrum of the Milky Way Galaxy.
The answer is under c):
Blue light has lower energy and a shorter wavelength compared to red light. The wavelengths of blue light are around nanometers, while red light is around nm. By knowing this, the only logical answer remains under c).
In this problem, we will see the connection between the energy, frequency, and wavelength of an electromagnetic wave (light).
The relation that connects the frequency and wavelength of a photon (an eletromagnetic wave) is
where is the speed of light in a vacuum, the constant.
The energy of a single photon (quantum of light) can be obtained using Plank's equation
where is the photon's energy, is Planck's constant.
The energy of light in the electromagnetic spectrum increases as we increase its frequency or decrease its wavelength, as we can see in the equation .
Looking at these two relations above, it should not be that hard to connect the dots and get to the correct answer.
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