Properties of Waves | Wave Length ,Frequency , Wave Number

Properties of Waves:

Wavelength (λ):

            The distance between two successive crests or troughs of a wave is called wavelength. It is denoted by the Greek letter lambda (λ).

Its S.I. unit is a metre (m). but for convenience, it is often measured in nanometers and angstrom.     

            1 nm = 10-9 m

            1 Ao = 10-10 m

Frequency (ע):

            The number of waves passing through a point in unit time is called frequency of waves. It is denoted by the Greek letter nu (ע). Its S.I. unit is s-1 or hertz (Hz).

                                                ע = c / λ

Speed (c):

            The distance covered by radiations in unit time (usually one second) is called the speed of radiation. It is denoted by the letter “c”. Its S.I. unit is m/s.

The speed of radiation is usually constant and is 3 x 108 m/s or 186000 miles/s.

Wave number :

            The reciprocal of wavelength is called wave number. Wave number is also defined as the “Number of waves in unit length.”

Its S.I. unit is m-1.

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