1.WHAT IS THE MEANING OF PHASE OF A WAVE?2.WHAT IS ANGULAR FREQUENCY \"ω\"?3.WHAT IS THE MEANING OF TRAVELLING WAVE?DO WAVES REALLY TRAVEL?

Dear araku

The distance from  one crest to the next is called the wavelength λ (Greek letter lambda). More generally,
the wavelength is the minimum distance between any two identical  points (such as the crests) on adjacent waves, as shown in Figure
If you count the number of seconds between the arrivals of two adjacent  waves, you are measuring the period T of the waves. In general, the period is the  time required for two identical points (such as the crests) of adjacent waves to pass by a point.

and angular frequency is define as  w =2∏/T

To understand the travelling of wave let these figure....

For any given time t, the wave function y as a function of x defines a curve representing the shape of the pulse at this time. This curve is equivalent to a “snapshot” of the wave at this time. For a pulse that moves without changing shape, the
speed of the pulse is the same as that of any feature along the pulse, such as the crest shown in Figure . To find the speed of the pulse, we can calculate how far the crest moves in a short time and then divide this distance by the time interval.

So we say that wave is travel that distance.

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