n hydrogen, the transition from level 1 to level 2 has a rest wavelength of 121.6 nm. Suppose you see this line at a wavelength of 124.2 nm

Question

n hydrogen, the transition from level 1 to level 2 has a rest wavelength of 121.6 nm. Suppose you see this line at a wavelength of 124.2 nm in a Star. What is the velocity of this in the direction of the Earth?

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Yến Oanh 4 years 2021-08-25T09:40:09+00:00 1 Answers 28 views 0

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  1. Tryphena
    0
    2021-08-25T09:41:11+00:00
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    Answer:

    velocity of this in the direction of the Earth is 6.4 × 10^{6}  m/s

    Explanation:

    given data

    wavelength \lambda 1 = 121.6 nm

    wavelength \lambda 2 = 124.2 nm

    solution

    we get here first change in wavelength that is

    \triangle \lambda = 124.2 nm – 121.6 nm    ……………1

    \triangle \lambda = 2.6 nm  

    we get here velocity of direction of the Earth that is express as

    \frac{\triangle \lambda }{\lambda 1} =\frac{v}{c}     …………2

    put here value we get v

    v = \frac{3\times 10^8\times 2.6}{121.6}    

    v = 6.4 × 10^{6}  m/s

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