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The Speed of Sound: Temperature Change

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The speed of sound in air depends on the air temperature, as given by the following equation:

$$v_{sound}\approx 331.4+0.6 T\space ^{\circ}C$$

...where $T\space ^{\circ}C$ represents the temperature in Celsius.

Suppose the hottest day of the year is 65$^{\circ}C$ hotter than the coldest day of the year.