Physicshard · Past Paper
At a constant temperature, what is the ratio of speed of sound in Oxygen to that in Hydrogen? (Molecular mass O2=32, H2=2)
A4:1
B1:4
C16:1
D1:16
✓ Correct Answer: B — 1:4
Speed v ∝ 1/sqrt(M). v(O)/v(H) = sqrt(M(H)/M(O)) = sqrt(2/32) = sqrt(1/16) = 1/4.
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