Zitsanzo za Mafunso Okhudza Kufalikira kwa Mafunde a Magetsi
Kufalikira kwa mafunde amagetsi ndi lingaliro lofunika kwambiri mu fizikisi lomwe limafotokoza momwe mafunde, monga kuwala, mafunde a wailesi, ndi ma X-ray, amayendera mumlengalenga ndi zinthu zina. Munkhaniyi, tikambirana zitsanzo ndi mayankho awo okhudzana ndi kufalikira kwa mafunde amagetsi. Cholinga cha nkhaniyi ndikupereka kumvetsetsa kwakuya kwa lingaliro ili ndikugwiritsa ntchito maluso othetsera mavuto okhudzana nalo.
Kumvetsetsa Mafunde a Magetsi
Mafunde amagetsi ndi mafunde omwe amayenda mumlengalenga, akunyamula mphamvu zamagetsi ndi zamaginito. Mafunde awa safuna cholumikizira kuti afalikire, zomwe zimawalola kuyenda kudzera mu vacuum. Zitsanzo za mafunde amagetsi ndi monga kuwala kooneka, kuwala kwa ultraviolet, mafunde a wailesi, ma microwave, ma X-ray, ndi ma gamma rays.
Zigawo za Mafunde a Magetsi
Mafunde amagetsi (electromagnetic) amapangidwa ndi mafunde amagetsi (E) ndi mafunde amagetsi (B) omwe amasinthasintha mozungulira sinusoidal ndi perpendicular kwa wina ndi mnzake komanso mozungulira kulowera kwa mafunde. Liwiro la mafunde amagetsi (electromagnetic wave) mu vacuum ndi liwiro la kuwala (c) lomwe nthawi zambiri limatengedwa kuti ndi mamita 3 pa sekondi iliyonse.
Mafunso ndi Kukambirana Zitsanzo
Funso 1: Mafunde a Magetsi mu Vacuum
Zimadziwika kuti mafunde amagetsi ali ndi kutalika kwa mafunde kwa \( \lambda = 500 \) nm (nanometers). Werengani kuchuluka kwa mafunde.
Kukambirana:
Liwiro la kuwala mu vacuum \(c\) ndi \(3 \times 10^8\) m/s. Kutalika kwa mafunde \( \lambda \) ndi 500 nm, kapena 500 x \(10^{-9}\) m. Tikudziwa kuti liwiro la mafunde a electromagnetic ndi zotsatira za ma frequency (f) ndi kutalika kwa mafunde (\(\lambda\)).
\[
c = f \times \lambda
\]
Kuti tipeze kuchuluka kwa nthawi, tasinthanso fomula yomwe ili pamwambapa kuti ikhale:
\[
f = \frac{c}{\lambda}
\]
M'malo mwa ma values a \(c\) ndi \(\lambda\):
\[
f = \frac{3 \times 10^8 \, \text{m/s}}{500 \times 10^{-9} \, \text{m}}
\]
\[
f = \frac{3 \nthawi 10^8}{500 \nthawi 10^{-9}}
\]
\[
f = \frac{3 \nthawi 10^8}{5 \nthawi 10^{-7}}
\]
\[
f = \frac{3}{5} \nthawi 10^{15}
\]
\[
f = 0.6 \kuwirikiza 10^{15}
\]
\[
f = 6 \nthawi 10^{14} \, \malemba{Hz}
\]
Kotero, mafupipafupi a mafunde ndi \(6 \times 10^{14}\) Hz.
Funso 2: Mphamvu ya Mafunde a Magetsi
Mphamvu yapakati ya mafunde a electromagnetic imaperekedwa ndi:
\[
I = \frac{1}{2} \epsilon_0 c E_0^2
\]
Kumene \( \epsilon_0 = 8.85 \times 10^{-12} \, \text{C}^2/(\text{N} \cdot \text{m}^2)\) ndi permittivity ya vacuum, \(c\) ndi liwiro la kuwala, ndipo \(E_0\) ndi amplitude ya magetsi. Ngati amplitude ya magetsi \(E_0\) ya mafunde amagetsi ndi \(100 \, \text{V/m}\), dziwani mphamvu ya mafunde.
Kukambirana:
Sinthani mfundo zodziwika bwino mu fomula ya mphamvu:
\[
I = \frac{1}{2} \epsilon_0 c E_0^2
\]
\[
I = \frac{1}{2} (8.85 \times 10^{-12}) (3 \times 10^8) (100)^2
\]
\[
I = \frac{1}{2} (8.85 \times 10^{-12}) (3 \times 10^8) (10^4)
\]
\[
I = \frac{1}{2} (8.85 \times 10^{-12}) (3 \times 10^{12})
\]
\[
I = \frac{1}{2} (26.55 \nthawi 10^{0})
\]
\[
I = 13.275 \, \malemba{W/m}^2
\]
Kotero, mphamvu yapakati ya mafunde a electromagnetic ndi \(13.275 \, \text{W/m}^2 \).
Funso 3: Kugawanika kwa Mafunde a Magetsi
Mafunde amagetsi ozungulira mzere amakhala ndi mphamvu yake yamagetsi yolunjika motsatira x-axis ndi mphamvu yake yamagetsi motsatira y-axis. Ngati mphamvu yamagetsi ndi \(E_0 = 500 \, \text{V/m}\) ndipo mphamvu yamagetsi siikudziwika \(B_0\), dziwani kukula kwa \(B_0\).
Kukambirana:
Ubale pakati pa minda yamagetsi ndi minda yamagetsi m'mafunde amagetsi ndi motere:
\[
E_0 = c B_0
\]
Ndi ma values \( E_0 = 500 \, \text{V/m} \) ndi \( c = 3 \times 10^8 \, \text{m/s} \):
\[
B_0 = \frac{E_0}{c}
\]
M'malo mwa ma values a \(E_0\) ndi \(c\):
\[
B_0 = \frac{500}{3 \nthawi 10^8}
\]
\[
B_0 = \frac{500}{3} \nthawi 10^{-8}
\]
\[
B_0 = 1.67 \nthawi 10^{-6} \, \malemba{T}
\]
Kotero, kutalika kwa mphamvu ya maginito \(B_0\) ndi \( 1.67 \times 10^{-6} \, \text{T} \).
Mapeto
Kufalikira kwa mafunde amagetsi ndi lingaliro lofunikira mu fizikisi yokhala ndi ntchito zambiri kuyambira pakulankhulana mpaka chithandizo chamankhwala. Mwa kugwira ntchito pamavuto ngati omwe ali pamwambapa, tikuyembekeza kumvetsetsa bwino makhalidwe a mafunde amagetsi, monga kutalika kwa nthawi, kuchuluka kwa nthawi, mphamvu, ndi ubale womwe ulipo pakati pa magetsi ndi maginito. Kumvetsetsa bwino mfundo izi kumatikonzekeretsa kukumana ndi mavuto m'maphunziro, komanso m'magawo osiyanasiyana aukadaulo ndi mafakitale.
