select the correct answer. an electric bell i...
select the correct answer. an electric bell is kept under a bell - jar in which a vacuum has been created. slowly air is introduced in to the jar. what will happen to the sound of the electric bell? a. it will increase until it reaches its maximum. b. it will decrease until it stops. c. it will not change. d. it will increase and decrease periodically. e. it will decrease exponentially.
Answer
# Brief Explanations:
Sound requires a medium to travel. In a vacuum, there is no medium for sound waves to propagate, so the electric - bell's sound is inaudible. As air is introduced into the bell - jar, air acts as a medium for sound waves. The more air there is (i.e., as air is continuously introduced), the better the sound can travel, and the louder the sound will be until it reaches its maximum when the jar is full of air.
# Answer:
A. It will increase until it reaches its maximum.