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    Question

    What is the speed of sound in air at room temperature

    (approx)?  
    A 150 m/s Correct Answer Incorrect Answer
    B 343 m/s Correct Answer Incorrect Answer
    C 500 m/s Correct Answer Incorrect Answer
    D 1000 m/s Correct Answer Incorrect Answer

    Solution

    At room temperature (~20°C), speed of sound in air is around 343 m/s.   This speed increases in solids and liquids and decreases at higher altitudes.   It is much slower than light, which travels at 3 × 108, m/s.   That's why we see lightning before hearing thunder.

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