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☆☆☆☆☆The simplest definition is any sound that is unwanted. 'Noise' when referring to any waveform or signal, is interference from other outside sources that contaminates the original signal or waveform. As an example, the 'hiss' often heard when a radio is not tuned in to a station correctly can be thought of as noise. Similarly a scratch on an old style LP, a hum from a CD or even the drone from an amplifier can all be classed as noise.
Pitch is determined by sound wave frequency; how fast something is vibrating. High-pitched sounds are higher frequency meaning they are vibrating faster. Low pitch means they are vibrating slower.
frequency
The imaginary line that extends straight out from the center of a reflective surface is the optical axis.
to decide true or false
sound waves require a medium to transfer energy
FOR A+ USERS THE ANSWER IS Sound waves travel in all directions
sound waves require a medium to transfer energy
-- They are longitudinal waves and material medium is required for their propagation.
The device is called a "variac' and it is a type of transformer. It has a variable voltage ouput.
true
Surface waves
