Question

Four different observers are standing in a straight line on a street and hear a siren from a police car. Each person recorded their observations in the chart shown.
If the people are all lined up on the street at different blocks, and the police siren starts at block 3, which statement describes what block each person is standing at?

Wycleff is on block 1, Lilly is on block 4, Quincy is on block 12, and Emilia is on block 17.
Lilly is on block 1, Wycleff is on block 4, Quincy is on block 12, and Emilia is on block 17.
Lilly is on block 1, Wycleff is on block 4, Emilia is on block 12, and Quincy is on block 17.
Wycleff is on block 1, Lilly is on block 4, Emilia is on block 12, and Quincy is on block 17.

Answer 1

Answer:

D

Explanation:

Wycleff heard a low pitch sound the whole time, so the police car must have been moving away from him.  So he was at block 1.

Lilly observed a Doppler effect (change in pitch) first.  So the car must have passed her first, so she was at block 4.

Emilia observed a Doppler effect after Lilly.  So the car passed her after it passed Lilly, so she was at block 12.

Quincy heard a high pitch sound the whole time, so the police car must have been moving toward him.  So he was at block 17.

Answer 2

Answer: It's D!

Explanation:

hope this helps! :)