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wlasnosci falowe.pdf
The charge on the antenna has
reversed polarity now, and the
electric field at P points upward.
When the oscillator has completed half a
cycle, t = 1/2 T, the field at point P is
upward and of maximum magnitude.
•
Zmienne pole elektryczne generuje zmienne pole magnetyczne
•
Zmienne magnetyczne elektryczne generuje zmienne pole elektryczne
At t = 3/4 T the field at P
vanishes again. The fields
produced at earlier times continue
to move away from the antenna.
Field directions in an electromagnetic wave
Receiving radio waves
Basic elements of a tuning circuit used to
receive radio waves. First, an incoming wave
sets up an alternating current in the antenna.
Next, the resonance frequency of the LC
circuit is adjusted to match the frequency of
the radio wave, resulting in a relatively large
current in the circuit. This current is then fed
into an amplifier to further increase the signal.
At a time when the electric field
produced by the antenna points
downward, the magnetic field
points into the page. In general, the
electric and magnetic fields in an
electromagnetic wave are always at
right angles to each other.
An electromagnetic wave propagating in the positive x
direction. Note that E and B are perpendicular to each
other and in phase. The direction of propagation is given
by the thumb of the right hand, after pointing the fingers
in the direction of E and curling them toward B (palm
towards B).
Electromagnetic radiation is greatest
when charges accelerate at right angles
to the line of sight. Zero radiation is
observed when the charges accelerate
along the line of sight. These
observations apply to electromagnetic
waves of all frequencies.
Interferencja fali
Dyfrakcja
Zasada Huygens’a
Warunki interferencji
PrąĪki równej gruboĞci
P
Ğwiatáo
T
dsinT
Wzmocnienie
d
sin
ș
=
m
O
,
(
m
0,
r
1,
r
2...)
Osáabienie
'
A
=
d
sin
ș
=
(
m
-
1
O
(
m
0,
r
1,
r
2...)
2
Superpozycja fali
Soap Film Interference
•Co sĊ stanie gdy „zderzą” siĊ dwie fale
•Nasąpi ich „dodanie” , powstanie superpozycja fal
)
Dyfrakcja
Plik z chomika:
chaosandfury
Inne pliki z tego folderu:
wyklad1.pdf
(342 KB)
wlasnosci falowe-4.pdf
(836 KB)
rozw-4.jpg
(278 KB)
rozw-3.jpg
(292 KB)
rozw-2.jpg
(337 KB)
Inne foldery tego chomika:
Fizyka 2 - Ćwiczenia
Fizyka2
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