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Question

What is the approximate speed of sound in air at room temperature (approximately 20\(°C\))?

This question was previously asked in
RRB NTPC 2025 Graduate CBT 2 Question Paper PDF (10-Jul-2026) (Shift 1)
The correct answer is

343 m/s

The speed of sound in a medium depends on the medium's density and elasticity, and increases with temperature in gases.

At room temperature, approximately 20°C, sound travels through air at about 343 m/s.

Speeds like 1500 m/s and 5000 m/s correspond to sound travelling through water and solids like steel respectively, which are denser and more elastic media, not air.

Hence, the speed of sound in air at room temperature is approximately 343 m/s.

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