DP Physics (first assessment 2025)

Test builder »

Question EXE.2.HL.TZ0.d

Select a Test
Date Example questions Example questions Marks available [Maximum mark: 4] Reference code EXE.2.HL.TZ0.d
Level HL Paper 2 Time zone TZ0
Command term Calculate Question number d Adapted from N/A
d.
[Maximum mark: 4]
EXE.2.HL.TZ0.d

Another explosion is produced at X. The sound from this explosion is detected twice at the geophone at Z. Some sound travels directly from X to Z through clay along path 2. Other sound travels through clay via Y along path 3.

The vertical thickness of the clay layer is d. The distance XZ is 80.0 m.

The time between the arrival of the sounds due to the path difference is 6.67 ms.

Calculate d.

[4]

Markscheme

distance difference =3000×0.00667=19.8 m ✓

½ distance difference =9.9 m so YZ =49.9 m ✓

d=YZ2-XZ22=49.92-402 ✓


29.8 m ✓

OR

Recognises situation as (almost) 3:4:5 triangle ✓


30 m (1 sf answer only accepted in this route) ✓