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doppler shift

n.
1.change in the apparent frequency of a wave as observer and source move toward or away from each other

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    Idiom of the Day

    drive (someone) up a wall
    to irritate or annoy someone greatly
    My neighbor's constant complaining is driving me up a wall.



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    It ________ since yesterday morning.

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    Bharat Ratna : aruna asaf ali
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