4.6.1.4 Sound waves (HT only)

Spec reference: 4.6.1.4 (physics only) (HT only).

Triple-only content in this dot

• Sound can travel in solids; hearing works over limited frequency range.
• Normal human hearing range: 20 Hz to 20 kHz.

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?