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Q.

The speed of sound in oxygen O2 at certain temperature is 460 m/sec. The speed of sound in Helium (He) at same temperature will be (assumed both gases to be ideal)

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a

500 m/s

b

650 m/s

c

460 m/s

d

1420 m/s

answer is D.

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Detailed Solution

Speed of sound in gas  V=γRTm ∴  V1V2=γ1γ2×m2m1=75×453×32 ⇒460V2=2125×8 ⇒V2=460×5×2221=1420 m/sec

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