Answer:
343 m/s
Explanation:
The speed of sound in dry air can be calculated as:
[tex]v=331\sqrt[]{1+\frac{T}{273}}[/tex]Where T is the temperature in celsius. So, replacing T by 20 °C, we get:
[tex]\begin{gathered} v=331\sqrt[]{1+\frac{20}{273}} \\ v=331\sqrt[]{1+0.073} \\ v=331\sqrt[]{1.073} \\ v=331(1.036) \\ v=342.9\text{ m/s} \end{gathered}[/tex]Therefore, the speed of sound in dry air at 20 °C is approximately 343 m/s
