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# Answer to Question #2273 in Mechanics | Relativity for bongy

Question #2273
You are viewing a New Year's Day fireworks display at a distance of 1500 m. It is 4.0°C. How long does it take the sound of the fireworks exploding to reach you? answer in seconds.
Expert's answer
The speed of sound at 4.0&deg;C in the dry air can be derived by the formula:

$c_{\mathrm{air}} = 331.3 \mathrm{m \cdot s^{-1}} \sqrt{1+\frac{4}{273.15\;^{\circ}\mathrm{C}}} = 333.72 m/s$
t = s/cair = 1500/333.72 = 4.94 s

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