Question 9 of 9 Map Sapling Learning For each star below, determine how its ligh

Question

Question 9 of 9 Map Sapling Learning For each star below, determine how its light would be shifted. Please note that not all choices may be used, and some may be used more than once. A blue giant moving away from Earth at 22.7 km/s A red giant moving transversely at 32.9 km/s no wavelength shift redshift blueshift yellowshift A blue dwarf moving towards Earth at 5.5 km/s A blue dwarf moving away from Earth at 7.5 km/s A blue giant moving transversely at 7.1 km/s Previous Check Answer Next Exit submit Assignment Hint

Explanation / Answer

A. For a star moving away from the earth the light appears to be moving from shorter to longer wavelengths, so Answer: yellowshift
B. For a star moving transverse to the earth the light appears to be the same, so Answer: no wavelength shift
C. For a star moving towards the the earth the light appears to be the blueshifted, so Answer: blueshift
D. For a star moving transverse away from the earth the light appears to be moving from shorter to longer wavelengths, so Answer: yellowshift
E. For a star moving transverse to the earth the light appears to be the same, so Answer: no wavelength shift

The true statements are :
when the wavelength of peak emmisions occurs in blue part of the visible spectrum the star will appear blue
blue stars are hot as compared to red stars

The false statements are :
blue stars radiate like blackbodies
red light has shorter wavelength than blue light
red stars preferentially reflect red light
hot stars look red compared to cool stars

If star A and Star B are euqlly bright, then they can have differnt distances from earth and differnt radiation power, but the louminosity should be the same
so, option B, star A has same luminosity as star B

If star C has more light radiation than D
as the luminosity depends on distance from the star, and brightness depends on luminosity
-> None of the options in the questions options are correct

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