Q. The speed of sound oxygen $(O_{2})$ at a certain temperature is $460\ ms^{- 1}.$ The speed of sound in helium $(He)$ at the same temperature will be (assume both gases to be ideal)
A) $500\ ms^{- 1}$
B) $650\ ms^{- 1}$
C) $330\ ms^{- 1}$
D) $1420\ ms^{- 1}$
Explanation
(d) $v_{He} = 460 \times \sqrt{\frac{25}{21} \times 8} = 1420\ m/s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.