7 WavesAS Level

7.3 Doppler effect for sound waves

2 of 2 objectives have lessons · 0 studied · 0 secure

Lessons

The Doppler effect: a moving sourceWhy an ambulance siren drops in pitch as it passes you, and what is actually changing in the sound. 9 min, not started
The Doppler formula, sign by signWhere f-o equals f-s v over (v plus or minus v-s) comes from, how to choose the sign every time, and how to use it backwards. 10 min, not started

Syllabus objectives

2 objectives

What Cambridge says you should be able to do, in our words. Codes are the topic number plus the objective’s position.

7.3.1

Understand that, when a source of sound waves moves relative to a stationary observer, the frequency the observer detects differs from the frequency of the source.

The case of a stationary source and a moving observer is not required.

Taught in: The Doppler effect: a moving source · 6 questions

7.3.2

For a source of sound waves moving relative to a stationary observer, use f_o = f_s v / (v ± v_s) for the observed frequency.

Taught in: The Doppler formula, sign by sign · 5 questions