SSC General Science & Technology Sample Paper NCERT Sample Paper-2

  • question_answer
    An artificial satellite can be tracked very precisely from the earth by using

    A)  Doppler-effect

    B)  radar

    C)  Sonar  

    D)  Zeeman Effect

    Correct Answer: A

    Solution :

    [a] The Doppler Effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding. The Doppler Effect is of intense interest to astronomers who use the information about the shift in frequency of electromagnetic waves produced by moving stars in our galaxy and beyond in order to derive information about those stars and galaxies.

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