1.1. State what happens to the frequency and pitch of a sound as the source moves away from an observer.

1.2. State the name of the effect in which the frequency of a sound wave changes as the source of the sound moves relative to an observer.

1.3. The change in frequency of a sound wave as the source of the sound moves relative to an observer can be described by the equation

${f}_{o}={f}_{s}\frac{v}{(v\pm{v}_{s})}$

State the meaning of the following terms and their associated units

(i) ${f}_{o}$

[1]

(ii) ${f}_{s}$

[1]

(iii) $v$

[1]

(iv) ${v}_{s}$

[1]

1.4. State the equation as it would be used to calculate the frequency of an observed sound moving away from an observer.