Kyoko asked in Science & MathematicsPhysics · 5 months ago

help please?

A galaxy ngc 4414 is moving awat from us at 7.16*10^5. by how much will the frequency of the 6.91*10^14 hz hydrogen line be shifted in the galaxy's spectrum?

1 Answer

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  • NCS
    Lv 7
    5 months ago
    Favorite Answer

    f = f₀ * c / (c + v)

    where c is the speed of light and v is the speed of the galaxy moving away

    so

    f = 6.91e14Hz * 3e8 / (3e8 + 7.16e5) = 6.89e14 Hz

    and so the SHIFT is

    (6.91 - 6.89)e14 Hz = 1.65e12 Hz

    Hope this helps!

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