DP Physics (last assessment 2024)
Question 18M.3.SL.TZ1.7b.ii
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.3.SL.TZ1.7b.ii |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Calculate | Question number | b.ii | Adapted from | N/A |
b.ii.
[Maximum mark: 1]
18M.3.SL.TZ1.7b.ii
The pressure–volume (pV) diagram shows a cycle ABCA of a heat engine. The working substance of the engine is 0.221 mol of ideal monatomic gas.
At A the temperature of the gas is 295 K and the pressure of the gas is 1.10 × 105 Pa. The process from A to B is adiabatic.
(b.ii)
For the process BC, calculate, in J, the change in the internal energy of the gas.
[1]
Markscheme
ΔU = pΔV = 5.07 × 105 × 3 × 10–3 = 2.28 × 10–3 «J»
Accept alternative solution via Tc.
[1 mark]
