PhysicsEasy251×since 2002Q7408The root mean square speed of smoke particles of mass 5×10−17 kg5 \times 10^{-17} \mathrm{~kg}5×10−17 kg in their Brownian motion in air at NTP is approximately. [Given k=1.38×10−23JK−1\mathrm{k}=1.38 \times 10^{-23} \mathrm{JK}^{-1}k=1.38×10−23JK−1]A60 mm s−160 \mathrm{~mm} \mathrm{~s}^{-1}60 mm s−1B12 mm s−112 \mathrm{~mm} \mathrm{~s}^{-1}12 mm s−1C15 mm s−115 \mathrm{~mm} \mathrm{~s}^{-1}15 mm s−1D36 mm s−136 \mathrm{~mm} \mathrm{~s}^{-1}36 mm s−1Check answerSkip