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The speed of sound in oxygen (O₂) at a certain temperature is 460 m s⁻¹. The speed of sound in helium (He) at the same temperature will be (assume both gases to be ideal)
- 1421 m s⁻¹
- 500 m s⁻¹
- 650 m s⁻¹
- 330 m s⁻¹
Correct answer: 1421 m s⁻¹
Solution
The speed of sound in a gas is inversely related to the square root of its molar mass; helium, being much lighter than oxygen, allows sound to travel faster through it, resulting in a significantly higher speed of sound.
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