Everything about Wavelengths totally explained
In
physics wavelength is the distance between repeating units of a propagating
wave of a given
frequency. It is commonly designated by the
Greek letter lambda (λ). Examples of wave-like phenomena are
light,
water waves, and
sound waves.
In a wave, a property varies with the position. For example, this property can be the air
pressure for a
sound wave, or the magnitude of the
electric or the
magnetic field for
light. The wavelengths of frequencies audible to the human ear (20 Hz–20 kHz) are between approximately 17 m and 17 mm, respectively. Visible light ranges from deep red, roughly 700 nm to violet, roughly 400 nm (430–750 THz). For other examples, see
electromagnetic spectrum.
Relationship with frequency
Wavelength
λ is inversely proportional with the
frequency, the number of periods per time unit passing a given point, as in
»
where
h is Planck's constant, and p is the momentum of the particle. This hypothesis was at the basis of quantum mechanics. Nowadays, this wavelength is called the de Broglie wavelength. For example, the electrons in a CRT display have a De Broglie wavelength of about 10-13 m.'
Further Information
Get more info on 'Wavelengths'.
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