What is the speed of sound at Sea Level at 21C in m/s?

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Multiple Choice

What is the speed of sound at Sea Level at 21C in m/s?

Explanation:
Sound travels faster in warmer air because the molecules are moving faster and can transmit disturbances more quickly. In air, the speed of sound can be estimated with c ≈ sqrt(gamma * R * T), where gamma is about 1.4 for air and R is about 287 J/(kg·K). Use T in kelvin. For 21°C, T = 294 K. Multiply: gamma * R * T ≈ 1.4 * 287 * 294 ≈ 118,000. The square root of that is about 344 m/s. That matches the commonly cited value near 343 m/s at 20°C and rises slightly with temperature, so 344 m/s is the appropriate estimate at 21°C. Other options are not consistent with this temperature and medium: they’re either too low for air at this temperature or imply a different medium or conditions.

Sound travels faster in warmer air because the molecules are moving faster and can transmit disturbances more quickly. In air, the speed of sound can be estimated with c ≈ sqrt(gamma * R * T), where gamma is about 1.4 for air and R is about 287 J/(kg·K). Use T in kelvin.

For 21°C, T = 294 K. Multiply: gamma * R * T ≈ 1.4 * 287 * 294 ≈ 118,000. The square root of that is about 344 m/s. That matches the commonly cited value near 343 m/s at 20°C and rises slightly with temperature, so 344 m/s is the appropriate estimate at 21°C.

Other options are not consistent with this temperature and medium: they’re either too low for air at this temperature or imply a different medium or conditions.

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