In a laboratory, light from a particular spectrum line of helium passes through a diffraction grating and the second-order maximum is at 18.9° from the center of the central bright fringe. The same grating is then used for light from a distant galaxy that is moving away from the earth with a speed of 2.65 x 107 m/s. For the light from the galaxy, what is the angular location of the second-order maximum for the same spectral line as was observed in the lab?

In a laboratory, light from a particular spectrum line of helium passes through a diffraction grating and the second-order maximum is at 18.9° from the center of the central bright fringe. The same grating is then used for light from a distant galaxy that is moving away from the earth with a speed of 2.65 x 107 m/s. For the light from the galaxy, what is the angular location of the second-order maximum for the same spectral line as was observed in the lab?

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Question

In a laboratory, light from a particular spectrum line of helium passes through a diffraction grating and the second-order maximum is at 18.9° from the center of the central bright fringe. The same grating is then used for light from a distant galaxy that is moving away from the earth with a speed of 2.65 x 10⁷ m/s. For the light from the galaxy, what is the angular location of the second-order maximum for the same spectral line as was observed in the lab?

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