JEE Main 2022 · 25 Jul · Shift 2 · Physics Q44

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PhysicsSingle correct+4 / -1Question 44 of 90

Sound travels in a mixture of two moles of helium and n moles of hydrogen. If rms speed of gas molecules in the mixture is $\sqrt2$ times the speed of sound, then the value of n will be :

Answer and worked solution

Official answer: B

Ratio $\sqrt{3/\gamma}=\sqrt2$ gives $\gamma=\frac32$ .

Mixture. $\gamma=\dfrac{5+3.5n}{3+2.5n}=\frac32$ gives $n=2$ .

(B)

Topics:Specific heats of gases Speed of waves

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JEE Main 2022 · 25 Jul · Shift 2, Physics question 44