Question

In the experiment to show that a medium is necessary for propagation of

sound as the quantity of air inside the bell jar decreases the level of ringing

sound heard outside is​

Answer 1

The sound heard outside also decreases.

• Sound is defined as the mechanical wave that requires medium for its propagation. The particles of sound waves while propagation move in parallel direction with the wave.
• The experiment performed to prove that sound requires medium to travel, bell jar experiment is done.
• The decrease in air by the help of vacuum pump decreases the sound heard outside the jar.