The Doppler Effect $-$ Multiple Choice Questions

For each multiple choice problem, give an explanation in the space provided below the question.

For the first three questions, imagine you are swinging on a swing and there is a stationary whistle blowing in front of you.

$1$

$1$

At what position will you hear the highest frequency?

b$.$ at the highest point, closest to the whistle

c$.$ at the lowest point, approaching the whistle

$2.$

At what position will you hear the lowest frequency?

a$.$ at the highest point, closest to the whistle

b$.$ at the highest point, farthest from the whistle

c$.$ at the lowest point, approaching the whistle

d$.$ at the lowest point, moving away from the whistle

e$.$ both $"a"$ and $"b"$

f$.$ both $"c"$ and $"d"$

d$.$ at the lowest point moving away from the whistle

e$.$ both $"a"$ and $"$b$"$

f$.$ both $"c"$ and $"d"$

$3.$

At what position will you hear the actual frequency of the whistle?

a$.$ at the highest point, closest to the whistle

d$.$ at the lowest point moving away from the whistle

b$.$ at the highest point, farthest from the whistle

$($e$.$ both $"$a$"$ and $"$b$"$

c$.$ at the lowest point, approaching the whistle

f$.$ both $"$c$"$ and $"d"$

$4.$ A car horn has a frequency of $400Hz.$ The car is moving away from an intersection at $20\frac{m}{s}.$ The freq