When we study an astronomical object like a star or galaxy, we a star or galaxy,

Question

When we study an astronomical object like a star or galaxy, we a star or galaxy, we usually examine the spectrum of light it gives off. Recall that the spectrum of an object contains lines that work Iike fingerprints to help identify different elements. Since the lines of a spectrum occur at specific wavelengths we can determine that an object Is moving when we see that the lines have been shifted to either longer or shorter wavelengths. For the absorption line spectra shown below, blue light is shown on the left-hand side and red light is shown on the right-hand side. star that Is moving away from you. Which of the three spectra, corresponds with the star moving toward you? Explain your reasoning Which of the three spectra, corresponds with the star moving away from you? Explain your reasoning.

Explanation / Answer

spectra c corresponds with the star moving towards us. the shift is towards blue; blue shift, due to an increase in the frequency due to star approching the observer.

spectra b corresponds with the star moving away . the shift is towards red; red shift, due to a receding star.

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