1. Which statement is not listed as a detail in the passage?

A. The oncoming sound waves have a higher pitch because of high frequency and closeness

of waves.

B. The oncoming sound waves have a higher pitch because of low frequency and closeness

of waves.

C. The whistling sound of the locomotive as it approaches and passes can be explained by

the Doppler effect.

D. The high-pitched sound of the ambulance as it approaches and passes can be explained

by the Doppler effect.

2. What is the main idea of the passage?

A. Trains and ambulances make distinctly loud noises.

B. Low-frequency waves make high-pitched sounds.

C. High-frequency waves make low-pitched sounds.

D. The Doppler Effect explains the rationale for why sound is heard initially more strongly

and then faintly after a moving object has passed.

3. What is the meaning of the word phenomenon in the second paragraph?

A. Something that is lifeless to the senses

B. Something that is nonchalant

C. Something that is significant but unusual

D. Something that is chemical in origin