4.6.1.5 Waves for detection and exploration (HT only)

Spec reference: 4.6.1.5 (physics only) (HT only).

Triple-only content in this dot

• Use ultrasound/seismic/echo principles for detection and exploration.
• P-waves vs S-waves evidence for Earth structure.

Exam quick-check

• Can I identify this as a triple-only point from wording in the question?
• Can I apply the correct equation/idea with units and a clear conclusion?