Sound Waves

•    Sound is a mechanical wave that results from the back and forth vibration of the particles of the medium through which the sound wave is moving.
•    If a sound wave is moving from left to right through air, then particles of air will be displaced both rightward and leftward as the energy of the sound wave passes through it.
•    The motion of the particles is parallel (and anti-parallel) to the direction of the energy transport. This is what characterizes sound waves in air as longitudinal waves.
•    The mechanical vibrations which can be said as sound are able to travel through all forms of matter i.e. solids, liquids and gases. The matter which allows the sound to travel through it is called the medium.
•    Sound cannot travel through a vacuum.

Wave

Wave- A wave can be described as a disturbance that travels through a medium from one location to another location without the transport of matter.

Types of Waves
Waves can be said of two types – 1. Mechanical Wave and 2. Non – Mechanical Wave

Simple Harmonic Motion

Periodic Motion: Any motion which repeats itself at regular intervals of time is called Periodic Motion or Harmonic Motion. Some of the examples of periodic motion are a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, the Earth in its orbit around the Sun, and a water wave.

•    The interval of time for a repetition, or cycle, of the motion is called a period.
•    The number of periods per unit time is called the frequency.

Thus, the period of the Earth’s orbit is one year, and its frequency is one orbit per year. A tuning fork might have a frequency of 1,000 cycles per second and a period of 1 millisecond (1 thousandth of a second).