Read the passage and answer the questions The Sound Produced by the School bell will be heard by all of us respective of whether in a room at the back of bell. What is the energy of above passage ? what is the medium? Does sound travels only in air?
Answers
Explanation:
Energy can neither be created nor be destroyed it can change from one form to another. Does this law apply to sound too?
Yes, sound being a form of energy is created through another form of energy. For example: when we clap our hands we hear sound, this sound is produced due to conversion of muscular energy of our hand to sound energy.
Q.4 What are the different types of sound on the basis of frequencies?
On the basis of frequencies, sound can be:
(a) Infrasound – frequencies below than 20 Hz
(b) Audible sound – frequencies between 20 Hz to 20,000 Hz.
(c) Ultrasound - frequencies above 20,000 Hz
Q.5 What is a supersonic speed?
When the speed of an object exceeds the speed of the sound, then the speed with which the body travels is supersonic speed. For example, aircrafts, bullet, etc. which travels at a higher speed than the speed of sound.
Sound is a type of energy caused by vibrations.
Explanation:
- Sound occurs when an object vibrates which in turn causes movement in surrounding air molecules. These air molecules bump into the molecules close to them, causing those molecules to vibrate as well and it continues until the vibrations reach our eardrums.
Therefore, Sound energy is talked about in the above passage.
- Sound requires a medium to travel because it is the vibrations caused by molecules which cause sound. If there are no molecules, no sound will be able to travel.
Here, Air is the medium.
- Sound can travel through any medium except Vacuum as there are no molecules to cause vibrations. For example: Glass, Water etc.
Therefore, No, Sound does not only travel through air.