speed of sound in dry air at 20 °C is___________?
Correct answer: C. 343 m/s
- A. 353 m/s
- B. 345 m/s
- C. 343 m/s
- D. none of them
Explanation
At 20 °C, sound travels through dry air at approximately 343 metres per second. The speed changes with temperature, which is why values such as 331 m/s apply to colder air.
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