The
Doppler effect, or Doppler mutation, was first named after the Austrian
physician Christian Doppler, who spoke of this effect in 1842. According to
Doppler, when an observer is moving relative to a source, the frequency of the
wave changes, and this can usually be experienced when a vehicle with a hood or
horns is moving. The closer it comes to moving and the slower it gets. For
example, if you are on the road an ambulance comes near you and crosses. At
this point, as soon as the ambulance reaches you, in this case, the sound waves
born from the front of the ridge will be suppressed. Due to this suppressed
state of the sound waves will produce high frequency or high-pitched sound. As
the ambulance passes around, you will almost hear the sound it produces.
As
the ambulance moves a little further away from you, the ambulance from the back
to the side will expand into the sound which will produce low frequency or low
noise.
The
same thing can be seen in the wave of light, and especially the wavelengths of
light emitted from an observatory.
If
a star is moving toward the observer, the wavelengths of light emitted from the
star will be suppressed on the opposite side of the star, resulting in higher
frequency waves. The high-frequency visible light is blue, so we call this the
blue shift. If a star is moving farther from the observer, then the light
produced by the star will expand at the wavelength, and in this case, lower
frequency light waves will be generated. The low-frequency look is the light
red color. This is what we call a redshift. When we look at the universe, it
is clear that all the stars are moving away from us, which makes it clear that
the distance between the stars is increasing and therefore we can say that the
universe is rotating. We see this drastic change in the way the universe is
essentially constantly evolving.
Physicists
have also theoretically proven the spread of the universe. If we move the
universe backward, then the slowdown would bring about 14 billion pre-Big
Bang events when the universe was essentially too small.
