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Q.

An assembly of smoke particles in air at NTP is under consideration. If the mass of each particle is 5 x l0-17 kg, then the rms speed is(Given: k = 1.38 ×19-23 JK-1)

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a

1.5 cm s-1

b

1.5 mm s-1

c

1.5 ms-1

d

1.5 km s-1

answer is A.

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Detailed Solution

12mC2 = 32kT, C = 3kTm    = 3×1.38×10-23×2735×10-17   = 15 × 10-3 ms-1 = 1.5 cms-1
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