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   c.  Speed of sound

        1)  332 m/s in air at 0 C.

        2)  Changes by 0.6 m/s for every Celsius degree from 0 C.

        3)  Subsonic – slower

        4)  Supersonic – faster than sound (Mach 1 = speed of sound)

        5)  Sonic boom (pressure cone)

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