Answer:
agree with student 2, disagree with student 1
Explanation:
If you want to know if the wavelength of light was shifted you have to know the original wavelengths
Since we know the absorption spectrum for elements like hydrogen, we can look for these absorption lines in the star's spectra and figure out what direction these lines are shifted and tell if the star is moving away or towards us
The color of the star refers to the temperature of the star's surface which is not related to the doppler shift of the star
the Doppler effect allows finding that the correct answer is:
Student 2. You must measure the variation of the emitted wavelength to know if the star is moving away or closer
The Doppler effect is the change in frequency of a wave due to the relative movement between the source and the observer, in the case of stars we use that there is a relationship of the speed of light
c = λ f
f =[tex]\frac{c}{\lambda }[/tex]
where c is the speed of light, λ the wavelength and f the frequency of radiation
the doppler effect relationships are
f’= f₀ [tex]\sqrt{ \frac{1 - \frac{v}{c} }{1 + \frac{v}{c} } }[/tex]
where f and f₀ are the observed and emitted frequencies, respectively, v is the relative velocity of the emitter and the observer, this velocity is positive if the two bodies move away
we substitute
[tex]\frac{1}{\lambda} = \frac{1}{\ \lambda_o} \ \sqrt{\frac{1- \frac{v}{c} }{1+\frac{v}{c} } }[/tex]
The stars are formed fundamentally by Hydrogen, for which the emitted wavelengths correspond to the emission spectrum of; Hydrogen binding and therefore the observed wavelength variation is a proof of the relative motion of the stress and we.
On the other hand, the color of the light emitted by the star is related to the temperature of the stars through Wien's displacement law.
λ T = 2,898 10⁻³
As a result, student 2 is right and student 1 is wrong.
In conclusion using the Doppler effect the correct answer is:
Learn more about the Doppler effect here:
https://brainly.com/question/3154428
