Skip to content
Prep
Freely
Home
TOEFL
IELTS
Guides
Log in
Sign up
P
Account
Profile
My progress
Settings
Log out
TOEFL
/
Listening practice
/ Section DPZ9
Listen to an Academic Talk
Listen to a talk in a physics class.
Listen
27. Why does the professor mention trumpet players on a train?
A
To show that music sounds better outdoors
B
To describe an early experiment that supported Doppler's idea
C
To give an example of a modern use of the effect
D
To explain how Doppler first noticed the effect