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18 June, 13:00

a spaceship is traveling at a speed of 15000 km/s from planet b toward planet a the spaceship sends out a signal with a wavelength og 4 nm if astronomers living on planets a and b measure the radio waves coming from the spaceship what wavelengths will they measure?

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  1. 18 June, 13:16
    0
    Answer:of

    Astronomers living on planets a measure λO = 3.80_nm

    Astronomers living on planets b measure λO = 4.2_nm

    Explanation:

    Astronomers living on planets a measure λO = 3.80_nm

    Astronomers living on planets b measure λO = 4.2_nm

    a.) Speed of the radio wave

    c = 299792458 m/s.

    λO = λS (c - vS) / (c - vO)

    λO = observed wavelength

    λS = source constant wavelength = 4 nm

    c = wavefront constant velocity = 299792458 m/s

    vS = velocity of the source = 15000 km/s

    vO = velocity of the observer 0
  2. 18 June, 13:29
    0
    Answer: 4nmeter

    Explanation: The two observer a and b will measure the same wavelength since the speed of the space craft is very small compared with the speed of light c. That is

    V which is the speed of space craft 15000km/s = 15000000m/s

    Comparing this with the speed of light c 3*EXP (8) m/s we have

    15000000/300000000

    = 0.05=0.1

    Therefore the speed of the space craft V in terms of the speed of light c is 0.1c special relativity does not apply to object moving at such speed. So the wavelength would not be contracted it will remain same for both observers.
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