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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