Detecting visible light in the wavelength range, Physics

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Detecting visible light in the wavelength range

a) Suppose that a detector in the Hubble Space Telescope was capable of detecting visible light in the wavelength range of 400-700nm.

b) The detector measures visible wavelengths of 537.5nm, 480.1nm, and 453.4nm that researchers believe are due to the hydrogen atom. Why are all the known visible hydrogen lines not detected?

c) Use these data to calculate the speed of the stellar object that emitted the spectra. Assume that the object is not rotating. Why might rotation be an issue?

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