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# Year 11 Physics

## Module 3 | Waves and thermodynamics

### Content 3: Sound waves

#### Lesson 1 | Investigating soundwaves

• conduct a practical investigation to relate the pitch and loudness of a sound to its wave characteristics

• model the behaviour of sound in air as a longitudinal wave
Relate the displacement of air molecules to variations in pressure (ACSPH070)

#### Lesson 2 | Investigating intensity of sound

• investigate quantitatively the relationship between distance and intensity of sound

#### Lesson 3 | Investigating reflection, diffraction, resonance and superposition of soundwaves

• conduct investigations to analyse the reflection, diffraction, resonance and superposition of sound waves (ACSPH071)

#### Lesson 4 | Harmonics in strings and pipes

• investigate and model the behaviour of standing waves on strings and/or in pipes to relate quantitatively the fundamental and harmonic frequencies of the waves that are produced to the physical characteristics (e.g. length, mass, tension, wave velocity) of the medium (ACSPH072)

#### Lesson 5 | Analysing beats and the Doppler effect

• analyse qualitatively and quantitatively the relationships of the wave nature of sound to explain:
– beats $f_{beat} = \left | f_{2} -\ f_{1} \right |$

– the Doppler effect ${f}?=f\frac{v_{wave} + v_{observer}}{v_{wave} ? v_{source}}$