DP Physics (last assessment 2024)
Question 19N.3.SL.TZ0.b(iii)
| Date | November 2019 | Marks available | [Maximum mark: 2] | Reference code | 19N.3.SL.TZ0.b(iii) |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Explain, State | Question number | b(iii) | Adapted from | N/A |
b(iii).
[Maximum mark: 2]
19N.3.SL.TZ0.b(iii)
An ideal gas consisting of 0.300 mol undergoes a process ABCD. AB is an adiabatic expansion from the initial volume VA to the volume 1.5 VA. BC is an isothermal compression. The pressures at C and D are the same as at A.
The following data are available.
Pressure at A = 250 kPa
Volume at C = 3.50 × 10–3 m3
Volume at D = 2.00 × 10–3 m3
The gas at C is further compressed to D at a constant pressure. During this compression the temperature decreases by 150 K.
For the compression CD,
state and explain whether the second law of thermodynamics is violated.
[2]
Markscheme
not violated ✔
the entropy of the surroundings must have increased
OR
the overall entropy of the system and the surroundings is the same or increased ✔
