The speed of light in a vacuum is 30108 ms a blue shift, Ask an Expert

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The speed of light in a vacuum is 3.0*10^8 m/s. A blue shift occurs when an object that is emmitting light moves towards the observer. A shooting star approaches the Earth at 2*10^4 m/s and is emmitting light with a wavelength of 400 nm. What wavelength of light does an astronomer see as he observes the shooting star?

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