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Introductory Physics Homework Help
Calculating the Speed of a Galaxy Using Diffraction Grating and Doppler Effect
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[QUOTE="HaLAA, post: 5026207, member: 525641"] [h2]Homework Statement [/h2] Taking light collected by the telescope and shine it through a diffraction grating with a 765.5 lines/mm. Using the filter that just the brightest Helium II line. you cast the diffraction grating's diffracted pattern on a screen is 22.000cm away and there are 3 dots, m=-1, m=0 amd m=1. the distances between m=-1 and m=1 is 10.7314. find the speed of the galaxy moving away from us? [h2]Homework Equations[/h2] d sin theta =m lambda y_m=Ltan lambda Doppler effect [h2]The Attempt at a Solution[/h2] At first, I think I need to find the angel by using: y_m=Ltan lambda then I have: 0.22 tan theta _1 =0.107314/2 → theta=47.3972 degrees Since I have the angel, I can find the wavelength of the light by using: d sin theta =m lambda then I have: 1mm/765.5 sin (47.3972)= 1*lambda → lambda = 962 nm I get stuck at this step, can anyone give me a hit to get the answer? Thanks [/QUOTE]
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Introductory Physics Homework Help
Calculating the Speed of a Galaxy Using Diffraction Grating and Doppler Effect
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