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  1. Speed of

    2. A.
    sound at 0°C is 1190 km p.h.
    B.
    sound varies 2.4 km p.h. per degree centrigrade rise in temperature
    C.
    sound at 0°C is called one Mach
    D.
    an aircraft flying at 2975 km p.h., is called 2.5 Mach
    E.
    All the above.

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    Answer : Option E

    Explanation :

    No answer description available for this question.

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