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The speed of sound in Hydrogen 1270ms^(-...

The speed of sound in Hydrogen `1270ms^(-1)`. What will be the speed in a mixture of oxygen and hydrogen mixed by volume ratio `1:4` ?

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`v prop ( 1)/( sqrt( rho)) prop ( 1)/( sqrt( M)) , M_("mix") = ( 32 xx1 + 2 xx 4 )/( 4+1) = 8, v_("mix") = V_(H) sqrt((M_(H))/(M_("mix"))),v_("mix") = 1270sqrt((2)/( 8)) = 635 ms^(-1)`
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