In an experiment, a flashlight and a buzzer are each placed in a vacuum chamber connected to a vacuum pump. They are switched on, and the air is slowly removed from the chamber. A sensor placed outside of the vacuum
chamber records the output of each device.
vacuum chamber
Device Vacuum Pump
Device Detected at
Sensor
Sensor
on
no
buzzer
off
yes
Vacuum
pump
on
yes
flashlight
off
yes
Which conclusion does the experiment support?
A. Sound waves travel farther than light waves.
B. Sound waves need a medium to travel
C. Light waves travel slower than sound waves.
D. Lightwaves need a vacuum to travel.