Shadowing Practice: Why Walls STOP Light Waves But Not Radio Waves? - Learn English Speaking with Video
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Have you ever wondered why radio signals can easily pass through the walls of your house, allowing you to listen to a radio station indoors,
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while visible light cannot pass through the same walls?
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If light is also an electromagnetic wave, why is it blocked by bricks, but radio waves are not?
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To answer this question, we first need to understand the electromagnetic spectrum.
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The electromagnetic spectrum is simply a collection of all types of electromagnetic waves arranged according to their frequency or wavelength.
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It includes radio waves, microwaves,
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infrared waves, visible light, ultraviolet rays, X-rays, and gamma rays.
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Although these waves have different names, they are all the same type of wave.
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The only difference between them is their frequency and wavelength.
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As we move from radio waves toward gamma rays, the frequency keeps increasing.
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You can think of frequency as how fast the wave is oscillating or wiggling.
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A higher frequency means the wave completes more oscillations every second.
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Therefore, visible light or gamma rays have a much higher frequency than radio waves.
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Now, in quantum physics, electromagnetic waves are not only treated as waves, but also as tiny packets of energy called photons.
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You can think of a photon as the smallest packet of light or electromagnetic energy.
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Every type of electromagnetic wave is made up of photons.
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However, the amount of energy carried by each photon depends on the frequency of the wave.
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This relationship is given by Planck's famous equation,
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which states that the energy of a photon is equal to Planck's constant multiplied by its frequency.
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Since Planck's constant is just a fixed number, the only quantity that changes is the frequency.
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Therefore, as the frequency increases, the energy of each photon also increases.
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Since radio waves have a very low frequency, each radio photon carries a very small amount of energy.
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On the other hand, visible light has a much higher frequency, so each visible light photon carries much more energy.
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X-rays and gamma rays have even higher frequencies, which means their photons are even more energetic.
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To understand why this matters, let us now look at what happens inside a brick.
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Every brick is made up of atoms, and each atom contains electrons.
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According to Bohr's atomic model, these electrons can exist in their orbits only in certain allowed energy levels.
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They can move to a higher energy level only if they receive exactly the required amount of energy.
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Now imagine a radio photon striking a brick.
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Since the energy carried by a radio photon is extremely small, it is not enough to excite the electrons inside the atoms of the brick.
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The electrons simply ignore the incoming photon because it does not provide the required energy.
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As a result, the radio wave passes through the brick with very little interaction.
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Now, consider a photon of visible light.
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The energy carried by a visible light photon is much closer to the energy required to excite the electrons inside the atoms.
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Therefore, when visible light strikes the brick, many electrons absorb this energy and become excited.
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During this interaction, the light is absorbed, reflected, and scattered in different directions instead of passing straight through.
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This is why you cannot see through the walls of your house.
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That is the fundamental reason why radio signals can enter your house, while visible light cannot.
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Woordenschat en spreektips bij deze les
Deze spreekles op niveau C1 is gebaseerd op de video “Why Walls STOP Light Waves But Not Radio Waves?”. Deze woorden komen het vaakst terug: wave, energy, photon, frequency, radio. Deze video bevat 39 zinnen en 572 woorden om na te spreken. Het gesproken deel duurt 4:12. De spreker praat in een gelijkmatig tempo van ongeveer 136 woorden per minuut, prettig om te shadowen. Slechts 73% van de woorden hoort bij de 3.000 meest gebruikte Engelse woorden, dus de woordenschat is pittig.
Belangrijke woorden in deze video
De 15 moeilijkste woorden uit de video, met uitspraak en betekenis:
| Woord | Uitspraak | Betekenis |
|---|---|---|
| photon zelfstandig naamwoord | /ˈfəʊtɒn/ | foton, lichtdeeltje |
| electromagnetic bijvoeglijk naamwoord | /ɪˌlɛk.tɹoʊ.mæɡˈnɛ.tɪk/ | elektromagnetisch |
| gamma zelfstandig naamwoord | /ˈɡæ.mə/ | gamma |
| atom zelfstandig naamwoord | /ˈætəm/ | atoom |
| excite werkwoord | /ɪkˈsaɪt/ | prikkelen, opwinden |
| wavelength zelfstandig naamwoord | /ˈweɪvˌlɛŋ(k)θ/ | golflengte |
| packet zelfstandig naamwoord | /ˈpæk.ɪt/ | pakket, pak |
| absorb werkwoord | /æbˈsɔɹb/ | absorberen, (in zich) opnemen |
| multiply werkwoord | /ˈmʌltɪplaɪ/ | vermenigvuldigen |
| oscillation zelfstandig naamwoord | /ˌɒ.sɪˈleɪ.ʃən/ | trilling |
| scatter werkwoord | /ˈskætɚ/ | uiteenspatten, uiteengaan |
| ultraviolet bijvoeglijk naamwoord | /ˌʌltɹəˈvaɪələt/ | ultraviolet |
| wiggle werkwoord | /ˈwɪɡəl/ | wiebelen |
| indoors bijwoord | /ɪnˈdɔɹz/ | indoor |
| infrared bijvoeglijk naamwoord | /ˌɪnfɹəˈɹɛd/ | infrarood |
Phrasal verbs die je zult horen
| Woord | Betekenis |
|---|---|
| see through werkwoord | doorheen zien |
Uitspraak om op te letten
- De klanken “sh” en “zh”: oscillation /ˌɒ.sɪˈleɪ.ʃən/, equation /ɪˈkweɪ.ʒən/
- Lange woorden — let op de klemtoon: electromagnetic /ɪˌlɛk.tɹoʊ.mæɡˈnɛ.tɪk/, oscillation /ˌɒ.sɪˈleɪ.ʃən/, ultraviolet /ˌʌltɹəˈvaɪələt/, energetic /ˌɛn.əɹˈdʒɛt.ɪk/
Klanken die Nederlandstaligen lastig vinden:
- Stemhebbende eindmedeklinker — /b/, /d/, /g/, /z/, /v/ niet verscherpen: absorb /æbˈsɔɹb/, indoors /ɪnˈdɔɹz/, infrared /ˌɪnfɹəˈɹɛd/, microwave /ˈmaɪkɹoʊˌweɪv/, arrange /əˈɹeɪnd͡ʒ/
- /æ/ — opener dan de Nederlandse “e”: electromagnetic /ɪˌlɛk.tɹoʊ.mæɡˈnɛ.tɪk/, gamma /ˈɡæ.mə/, atom /ˈætəm/, packet /ˈpæk.ɪt/, absorb /æbˈsɔɹb/
- /g/ — een harde plofklank, geen Nederlandse “g”: electromagnetic /ɪˌlɛk.tɹoʊ.mæɡˈnɛ.tɪk/, gamma /ˈɡæ.mə/, wiggle /ˈwɪɡəl/
Zo oefen je met deze video
- Luister de hele video één keer zonder te spreken en noteer de woorden die je niet kent.
- Spreek zin voor zin na op normale snelheid en herhaal elke zin tot je ritme gelijk is aan dat van de spreker.
- Neem jezelf op en vergelijk met het origineel; let daarbij op woorden als photon, electromagnetic, gamma.
Wat is de Shadowing-techniek?
Shadowing is een wetenschappelijk onderbouwde taalleermethode die oorspronkelijk is ontwikkeld voor professionele tolkentraining en gepopulariseerd door polyglot Dr. Alexander Arguelles. De methode is eenvoudig maar krachtig: je luistert naar native Engelse audio en herhaalt het onmiddellijk hardop — als een schaduw die de spreker volgt met slechts 1–2 seconden vertraging. In tegenstelling tot passief luisteren of grammaticadrills, dwingt shadowing je hersenen en mondspieren om echte spraakpatronen tegelijkertijd te verwerken en te reproduceren. Onderzoek toont aan dat het de uitspraaknauwkeurigheid, intonatie, ritme, verbonden spraak, luisterbegrip en spreekvaardigheid aanzienlijk verbetert — waardoor het een van de meest effectieve methoden is voor IELTS Speaking-voorbereiding en echte Engelse communicatie.