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Question 19M.2.SL.TZ2.2b

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.SL.TZ2.2b
Level SL Paper 2 Time zone TZ2
Command term Estimate Question number b Adapted from N/A
b.
[Maximum mark: 2]
19M.2.SL.TZ2.2b

A container of volume 3.2 × 10-6 m3 is filled with helium gas at a pressure of 5.1 × 105 Pa and temperature 320 K. Assume that this sample of helium gas behaves as an ideal gas.

(b)

Estimate the average speed of the helium atoms in the container.

[2]

Markscheme

1 2 m v 2 = 3 2 k T / v = 3 k T m / 3 × 1.38 × 10 − 23 × 320 6.6 × 10 − 27  ✔

v = 1.4 × 103 «ms−1» ✔ 

Examiners report

At HL this was very well answered but at SL many just worked out E=3/2kT and left it as a value for KE.

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