Answer Choices: G-Greater Than, L-Less Than, E-Equal To (i) The distance of Amy
ID: 1950092 • Letter: A
Question
Answer Choices: G-Greater Than, L-Less Than, E-Equal To
(i) The distance of Amy from the path in S is ..... in Q.
(ii) The speed in trial S is ..... to that in Q.
(iii) The speed in trial U is ..... that in S.
(iv) The speed in trial T is ..... that in other trials.
(v) The speed in trial R is ..... that in other trials.
(vi) When the car is far away, the average of the frequencies moving in and out is ..... the frequency at rest.
(b) Using the data on the figure, calculate the speed of the car in trial S. Use 340 m/s for the speed of sound.
Explanation / Answer
(i) L
(ii) E
(iii) G
(iv) L
(v) G
(vi) G
(b) assume observed frequency is f, real frequency is f0, velocity of sound is vs, velocity of car is v
then
f = (vs / vs - v) f0
or
f0/f = 1 - v / vs
900/990 = 1 - v / 340
v = 30.9 m/s