Cov Lus Nug Piv Txwv Sib Tham Txog Lub Spectrum Wave Electromagnetic
Pendahuluuan
Lub zog hluav taws xob electromagnetic spectrum yog qhov ntau thiab tsawg ntawm txhua hom hluav taws xob electromagnetic. Lub zog hluav taws xob electromagnetic yog lub zog uas mus ncig thoob plaws qhov chaw hauv daim ntawv ntawm nthwv dej. Piv txwv ntawm lub zog hluav taws xob electromagnetic suav nrog lub teeb pom kev uas peb pom, nthwv dej xov tooj cua siv rau kev sib txuas lus, thiab X-rays siv hauv kev kho mob. Tsab xov xwm no yuav muab ntau qhov teeb meem piv txwv uas tham txog lub zog hluav taws xob electromagnetic spectrum los pab nkag siab txog cov ntsiab lus yooj yim thiab lawv cov kev siv hauv lub neej txhua hnub.
Cov Spectrum ntawm Electromagnetic Wave
Ua ntej peb mus rau hauv cov lus nug piv txwv thiab kev sib tham, cia peb rov xyuas luv luv txog electromagnetic spectrum. Cov spectrum no tau muab faib ua ntau hom raws li wavelength lossis zaus, uas yog:
1. Cov Xov Tooj Cua: Cov qhov ntev ntawm cov xov tooj cua yog txij li 1 millimeter mus txog 100 kilometers. Siv rau hauv kev sib txuas lus hauv xov tooj cua thiab TV.
2. Microwaves: Qhov ntev ntawm nthwv dej yog txij li 1 millimeter mus txog 1 meter. Siv rau hauv radar thiab microwaves.
3. Infrared: Qhov ntev ntawm wavelength yog txij li 700 nanometers mus txog 1 millimeter. Siv rau hauv cov chaw taws teeb tswj, cov koob yees duab pom kev hmo ntuj, thiab cov khoom siv ntsuas kub.
4. Lub Teeb Pom Kev: Lub wavelength ntawm li ntawm 400 txog 700 nanometers. Qhov no yog lub spectrum uas tib neeg lub qhov muag pom tau.
5. Ultraviolet: Qhov ntev ntawm wavelength ntawm 10 txog 400 nanometers. Siv rau hauv kev tua kab mob thiab kev tshawb nrhiav forensic.
6. Cov duab xoo hluav taws xob: Qhov ntev ntawm 0.01 txog 10 nanometers. Siv rau hauv kev thaij duab kho mob.
7. Gamma Rays: Qhov ntev ntawm lub teeb tsawg dua 0.01 nanometers. Siv rau hauv kev kho mob qog noj ntshav.
Cov Lus Nug Piv Txwv thiab Kev Sib Tham
Lo lus nug thib 1
Lus Nug: Lub kav hlau txais xov tooj cua ua haujlwm ntawm qhov zaus ntawm 100 MHz. Nws qhov wavelength yog dab tsi?
Kev Sib Tham:
Nws paub tias:
– Zaus (f) = 100 MHz = 100 x 10^6 Hz
- Qhov ceev ntawm lub teeb (c) = 3 x 10^8 m/s
Tus qauv siv yog:
\[ \lambda = \frac{c}{f} \]
\[ \lambda = \frac{3 \times 10^8 \text{ m/s}}{100 \times 10^6 \text{ Hz}} \]
\[ \lambda = 3 \text{ meters} \]
Yog li, qhov wavelength ntawm lub teeb liab xov tooj cua yog 3 meters.
Lo lus nug thib 2
Lo lus nug: Yog tias qhov wavelength ntawm lub teeb infrared yog 900 nm, nws qhov zaus yog dab tsi?
Kev Sib Tham:
Nws paub tias:
– Qhov ntev ntawm lub teeb (λ) = 900 nm = 900 x 10^-9 meters
- Qhov ceev ntawm lub teeb (c) = 3 x 10^8 m/s
Tus qauv siv yog:
\[ f = \frac{c}{\lambda} \]
\[ f = \frac{3 \times 10^8 \text{ m/s}}{900 \times 10^{-9} \text{ meters}} \]
\[ f = 3.33 \times 10^{14} \text{ Hz} \]
Yog li, qhov zaus ntawm cov duab infrared yog 3.33 x 10 ^ 14 Hz.
Lo lus nug thib 3
Lo lus nug: Lub teeb ultraviolet muaj zaus ntawm 8 x 10^14 Hz. Nws qhov wavelength yog dab tsi?
Kev Sib Tham:
Nws paub tias:
- Zaus (f) = 8 x 10^14 Hz
- Qhov ceev ntawm lub teeb (c) = 3 x 10^8 m/s
Tus qauv siv yog:
\[ \lambda = \frac{c}{f} \]
\[ \lambda = \frac{3 \times 10^8 \text{ m/s}}{8 \times 10^14 \text{ Hz}} \]
\[ \lambda = 3.75 \times 10^{-7} \text{ meters} \]
\[ \lambda = 375 \text{ nm} \]
Yog li, qhov wavelength ntawm lub teeb ultraviolet yog 375 nm.
Lo lus nug thib 4
Lo lus nug: Ib qho chaw tso tawm cov microwaves nrog qhov ntev ntawm 5 cm. Nws qhov zaus yog dab tsi?
Kev Sib Tham:
Nws paub tias:
– Qhov ntev ntawm lub zog (λ) = 5 cm = 0.05 meters
- Qhov ceev ntawm lub teeb (c) = 3 x 10^8 m/s
Tus qauv siv yog:
\[ f = \frac{c}{\lambda} \]
\[ f = \frac{3 \times 10^8 \text{ m/s }}{0.05 \text{ meters}} \]
\[ f = 6 \times 10^9 \text{ Hz} \]
Yog li, qhov zaus ntawm cov microwaves yog 6 x 10^9 Hz lossis 6 GHz.
Lo lus nug thib 5
Lus Nug: Lub teeb xiav muaj qhov ntev ntawm li 450 nm. Lub zog ntawm lub photon los ntawm lub teeb xiav no yog dab tsi?
Kev Sib Tham:
Nws paub tias:
– Qhov ntev ntawm lub teeb (λ) = 450 nm = 450 x 10^-9 meters
- Qhov ceev ntawm lub teeb (c) = 3 x 10^8 m/s
– Planck tus nqi tas mus li (h) = 6.626 x 10^-34 Js
Tus qauv siv yog:
\[ E = hf \]
Nrog:
\[ f = \frac{c}{\lambda} \]
\[ f = \frac{3 \times 10^8 \text{ m/s}}{450 \times 10^{-9} \text{ meters}} \]
\[ f = 6.67 \times 10^{14} \text{ Hz} \]
\[ E = 6.626 \times 10^{-34} \text{ Js} \times 6.67 \times 10^{14} \text{ Hz} \]
\[ E = 4.42 \times 10^{-19} \text{ Joules} \]
Yog li, lub zog photon ntawm lub teeb xiav yog 4.42 x 10 ^ -19 Joules.
Xaus
Lub teeb hluav taws xob electromagnetic spectrum suav nrog ntau hom hluav taws xob nrog ntau qhov ntev thiab zaus sib txawv. Hauv tsab xov xwm no, peb tau tham txog ntau qhov teeb meem piv txwv uas npog ntau qhov ntawm lub spectrum no, los ntawm cov nthwv dej xov tooj cua mus rau lub teeb ultraviolet. Los ntawm kev nkag siab txog cov ntsiab lus yooj yim thiab kev xam, peb tuaj yeem siv cov kev paub no rau ntau yam kev tshawb fawb thiab thev naus laus zis xws li kev sib txuas lus, kev kho mob, thiab lwm yam kev siv. Vam tias, cov teeb meem piv txwv saum toj no tau pab koj nkag siab zoo dua txog lub teeb hluav taws xob electromagnetic spectrum.
Cov Lus Qhia Ntxiv Txog Kev Tawm Dag Zog
Kev xyaum ntxiv yeej ib txwm pab tau kom koj nkag siab txog cov ntsiab lus uas koj tau kawm. Nov yog qee cov lus nug ntxiv uas koj tuaj yeem sim:
1. Lub kav hlau txais xov tooj cua txais tau lub teeb liab uas muaj qhov ntev ntawm 75 cm. Txheeb xyuas nws qhov zaus.
2. Lub wavelength ntawm lub teeb liab yog 650 nm. Nws lub zog yog dab tsi?
3. Lub microwave muaj zaus ntawm 10 GHz. Txheeb xyuas nws qhov wavelength.
4. Cov duab xoo hluav taws xob muaj qhov ntev ntawm 0.1 nm. Xam lawv qhov zaus.
5. Lub teeb ntsuab muaj zaus ntawm 5.5 x 10^14 Hz. Txheeb xyuas nws qhov wavelength.
Kev ua haujlwm rau ntau qhov teeb meem yuav pab txhawb koj txoj kev nkag siab thiab kev txawj ntse hauv lub ncauj lus ntawm electromagnetic wave spectrum.
