# How many times the mean square velocity of helium molecules at 200K differs from the mean

October 9, 2021 | education

| **How many times the mean square velocity of helium molecules at 200K differs from the mean square velocity of this gas at 800K**

To calculate the difference in the root mean square velocities of helium molecules at given temperatures, we use the formula: n = √ (3R * Tc / MHe) / √ (3R * Tn / MHe) = √ (Tc / Tn).

Variables: Tк – the second temperature of helium (Tк = 800 К); Tn – the first temperature (Tn = 200 K).

Let’s calculate: n = √ (Tc / Tn) = √ (800/200) = 2 p.

Answer: With abs. at a temperature of 200 K, the root-mean-square velocity of helium molecules is 2 times less.

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