Sound can travel across a vacuum, according to the bell jar experiment.

The Given Statement is false 

As seen in the diagram, the bell jar used in the experiment is attached to a vacuum pump. You will be able to hear the bell if we turn the switch. Even though the same current is still flowing through the bell, the sound is progressively fainter as the air in the jar is gradually blown out. We will hear a very faint sound after some time when there is less air in the bell jar. We won't be able to hear any sound if all of the air is removed. According to the bell jar experiment, sound cannot travel through a vacuum.