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New Doppler Effect (Paperback)
Loot Price: R162
Discovery Miles 1 620
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New Doppler Effect (Paperback)
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Loot Price R162
Discovery Miles 1 620
Expected to ship within 10 - 15 working days
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The Doppler effect (or Doppler shift), named after Austrian
physicist Christian Doppler who proposed it in 1842 in Prague, is
the change in frequency of a wave for an observer moving relative
to the source of the wave. It is commonly heard when a vehicle
sounding a siren or horn approaches, passes, and recedes from an
observer. The received frequency is higher (compared to the emitted
frequency) during the approach, it is identical at the instant of
passing by, and it is lower during the recession. The relative
changes in frequency can be explained as follows. When the source
of the waves is moving toward the observer, each successive wave
crest is emitted from a position closer to the observer than the
previous wave. Therefore each wave takes slightly less time to
reach the observer than the previous wave. Therefore the time
between the arrival of successive wave crests at the observer is
reduced, causing an increase in the frequency. While they are
travelling, the distance between successive wave fronts is reduced;
so the waves "bunch together." Conversely, if the source of waves
is moving away from the observer, each wave is emitted from a
position farther from the observer than the previous wave, so the
arrival time between successive waves is increased, reducing the
frequency. The distance between successive wave fronts is
increased, so the waves "spread out." For waves that propagate in a
medium, such as sound waves, the velocity of the observer and of
the source is relative to the medium in which the waves are
transmitted. The total Doppler Effect may therefore result from
motion of the source, motion of the observer, or motion of the
medium. Each of these effects is analyzed separately. For waves
which do not require a medium, such as light or gravity in general
relativity, only the relative difference in velocity between the
observer and the source needs to be considered. The Doppler Effect
1-3] represents the frequency variation of the waves, received by
an observer which is drawing (coming), respectively it's removing
(going), from a wave spring (source). If a bright spring is drawing
to an observer, the frequency of waves received by the observer is
bigger than the emitted frequency of source, such that the
respective spectral lines are moving to violet. On the contrary, if
the light source is removing from the observer, the spectral lines
are moving to red. One proposes to study the Doppler Effect for the
light waves, generally for the electromagnetic waves.
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