Physics 9702/43 — October/November 2012

Cambridge A-Level · A Level Structured Questions · worked solutions for every part, with the mark scheme

questions

100

marks

120

minutes

Topics Magnetic Fields · Communication · Ideal Gases · Oscillations · Gravitational Fields · Electric Fields · +6 more

Q1Ideal GasesFree sample

An ideal gas has volume $V$ and pressure $p$ . For this gas, the product $pV$ is given by the expression

pV = \frac{1}{3}Nm \langle c^2 \rangle

where $m$ is the mass of a molecule of the gas.

(a)

State the meaning of the symbol

(i)

$N$ ,

(ii)

$\langle c^2 \rangle$ .

(b)

A gas cylinder of volume $2.1 \times 10^4\ \text{cm}^3$ contains helium-4 gas at pressure $6.1 \times 10^5\ \text{Pa}$ and temperature $12\ ^{\circ}\text{C}$ . Helium-4 may be assumed to be an ideal gas.

(i)

Determine, for the helium gas,

the amount, in mol,

amount = ______ $\text{mol}$

the number of atoms.

number = ______

(ii)

Calculate the root-mean-square (r.m.s.) speed of the helium atoms.

r.m.s. speed = ______ $\text{m s}^{-1}$

The rest of this paper

11 more questions

Q2Oscillations8M
Q3Gravitational Fields · Electric Fields10M
Q4Magnetic Fields · Motion in a Circle6M
Q5Magnetic Fields9M
Q6Alternating Currents8M
Q7Quantum Physics9M
Q8Nuclear Physics10M
Q9Electronics8M
Q10Medical Physics8M
Q11Communication6M
Q12Communication8M

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