파동 및 광학
도입됨| English | 의미 |
|---|---|
| diffraction/dɪˈfrækʃn/ | 회절 |
| coherence/kəʊˈhɪərəns/ | 간섭성 |
A decision before an answer
- Two individually bright waves can cancel at a point if their phases oppose.
- Your goal: Analyse wave superposition and interference.
Read the relationship
- Add wave amplitudes, then calculate intensity. Intensity is proportional to squared amplitude for the same medium.
- Use diffraction, polarisation and optical imaging.
Doubling wavelength at fixed slit width makes the first minimum angle:
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sin θ=λ/a increases.
Use the defining rule
- A path difference gives phase difference 2πΔ/λ. Coherent sources need stable relative phase.
- Relate phase, frequency and dispersion.
An ideal polariser transmits unpolarised intensity I as:
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Averaging the squared projection gives half.
Check the conditions
- For a single slit, minima satisfy a sin θ=mλ for nonzero integers m. A double slit has a different interference condition.
- Relate phase, frequency and dispersion.
Two equal coherent waves have amplitude A each. In phase, their total amplitude is 2A and intensity is 4I₀. With phase difference π, amplitude and ideal intensity are zero. Adding intensities directly misses interference.
For frequency 5 Hz and wavelength 2 m, wave speed is ____ m/s.
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v=fλ=5×2=10.
Apply the task format
- Geometric optics needs a stated sign convention. Wave effects matter when apertures are comparable to wavelength.
- Relate phase, frequency and dispersion.
The central single-slit maximum is not obtained by setting m=0 in the minima condition.
다음 중 이 사례에 부합하는 답안은 무엇입니까?
파의 중첩 및 간섭 분석
Wave intensities can always be added without considering phase.
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Coherent waves interfere through amplitude addition.
Keep the distinctions
- coherence 相干性 — A stable phase relationship between waves.
- diffraction 衍射 — Wave spreading and interference caused by an aperture or obstacle.
- Analyse wave superposition and interference.
- Use diffraction, polarisation and optical imaging.
- Relate phase, frequency and dispersion.
Match each term with its precise meaning in this lesson.
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Keep the distinctions stated in the teaching example.
Put this lesson’s reasoning or event sequence in order.
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The order follows the stated process; check each stage before the next.