In an experiment, a flashlight and 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 Detected at Vacuum Pump Sensor Buzzer off yes VCS 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. Light waves need a vacuum to travel.