Sound is a form of energy and it comes from vibrations. These vibrations create sound waves which move through mediums such as air and water before reaching our ears. Understand how sound waves come from vibrations in the form of compression and rarefaction and how your ears give you the ability to hear them.
The difference between Musical sound and noise - Music is produced by periodic vibrations, having regular wave pattern e.g. sound of musical instruments. Noise is produced by irregular vibrations, having irregular wave pattern. e.g.. sound produced by moving vehicle.
Learn about the characteristics of sound.
• Loudness-It distinguishes between loud and feeble sound.
• Pitch-It distinguishes between shriller and flatter sound.
• Timbre or quality-It distinguishes one sound from other having same loudness and pitch.
Learn about free(natural ) vibrations - When we strike the keys of a piano, various strings set in vibrations at their natural frequencies in absence of any external force on it. Damped vibrations - When a body is made to vibrate in a medium, the amplitude of vibrating body continuously decreases with time and ultimately body stops vibrating. Such vibrations are called the damped vibrations.
When we want to tune a radio or TV set, we merely adjust the values of electronic components to produce vibrations of frequency equal to that of radio waves which we want to receive. Learn how this matching is done due to resonance. Resonance is the phenomenon when the frequency of an applied periodic force is equal to its the natural frequency, the body readily begins to vibrate with an increased amplitude. Understand the conditions of resonance and forced vibrations.
A SmartTest on Sound