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The nucleus of an atom has a mass of 3.80 x 10^-25 Kg and is at rest. The nucleus is radioactive and suddenly ejects a particle of mass 6.6 x 10^-27 v Kg and Speed 1.5 x 10^7 m/s. Find the recoil speed of the nucleus that is left behind.
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Describe the effect on speed, frequency, and wavelength of a sound traveling from warm to cold air. (hint:cold air is more dense than warm air).
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