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Q.

Two molecules of a gas have speeds of 9 x 106 ms-l and 1 × 106 ms-1 respectively. What is the root mean square speed of these molecules?

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a

21 × 106  m/s

b

41 ×106 m/s

c

8.5 × 106 m/s

d

17 ×106 m/s

answer is B.

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Detailed Solution

For n-molecules, we know thatvrms = v12+v22+v23+....+ vn2n[vrms = root mean square velocity]where v1, v2, v3,...vn are individual velocities of n-molecules of the gas.For two molecules, vrms = v21+v222[v1, v2, v3,...vn are individual velocity]Given, v1 = 9 × 106 m/s and v2 = 1×106 m/s∴ vrms = (9×106)2+(1×106)22 = 41 × 106 m/s
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