Light waves
have wavelength, frequency, characterized by several key parameters. We
are normally familiar with visible light, infrared, ultraviolet, x-rays
and other statements, is that light waves by wavelength division name
for the post, in which the wavelength of visible light in the 4000-7000
Egyptian (Egypt = 1 billionth of a meter), with spectra of right-hand
side the shortest wavelength of the γ-ray is only one Egyptian, the
left side of the longest wavelength of electromagnetic waves are able
to reach a few centimeters or even meters. According to the formula: c
(speed of light) = λ (wavelength) X ν (frequency) we can see that the
speed of light as a field planting, so that different wavelengths of
light, the frequency is different. Of the frequency range of visible
light at 430 trillion Hz (red) and 750 trillion Hz (purple), with the
entire spectrum of the frequency with which they can be as small as 1
billion cycles per second under the (electromagnetic waves), as large
as 3 X 10 10 10 over 100 million cycles per second (γ rays). As a mode
of transmission of energy, light energy E = hυ (υ-frequency), that is,
wave energy and frequency proportional to the wave at different
frequencies with different energy, visible light energy of the highest
in purple, red light the lowest energy . In 1905 the famous Einstein
photoelectric effect that ultraviolet irradiation surface, the energy
will be passed to the surface electronics, so that the shackles from
the nucleus, released from the surface, so Einstein would be
interpreted as a kind of light a collection of energy - photons.
Descendants of this theory in turn further deepened, creating quantum
physics, believe that all matter has wave-particle two-phase nature,
but the proportion between the two are different, so light is a wave, a
photon at the same time is again posed. Yet, as a unique substance, it
still accounts for the main aspects of volatility. |
