Sound

• Sound waves are longitudinal waves that travel through solids, liquids, or gases.
• The speed of sound is determined by the medium it travels through.
• When an object vibrates, it creates alternating areas of high pressure and low pressure in the surrounding medium.
• There are three main causes of sound, source, medium and receiver
• The source could be music, a video or a person talking.
• The medium is gas, liquid and solids
• The receiver could be a human or an animal
• The loudness of a sound is dependent on the amplitude
• The loudness of the sound is measured in decibels
• The pitch of sound is dependent on its frequency
• If the frequency is higher, then the pitch is higher
• There are 3 categories of sound waves
• The three categories are audible sound waves, infrasonic sound waves and ultrasonic sound waves.