definition of loudness?

what is sonar ? explain with a diagram & give example

what is sound ? give an example

a gunshot is heard by you after two seconds it has been fired.what is the distance between you and the gun if the speed of sound is 330m/sec

please help me experts as i cannot understand this

please also the way it has been done

How can we hear our Heartbeat without a stethoscope?

Does sound travel faster in water or air? How

How does sound travel throught the stethoscope ?

 can someone explain Reverberation 

What is sound energy?

What is light energy?

What is Heat energy?

What is Chemical energy?

What is Electric energy?

What is magnetic energy?

What is nuclear energy?

what is pitch ?

What are the applications of sound?

 It is proved that sound travels fastest through solids. However, when a T.V is switched on, the sound produced is louder without a wall between the person watching than with a wall between the person watching and the T.V. How is this possible?

What is the speed of sound in air ?

 what is reflection of sound

what defines sond and what are the charcteristics of it?