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MODUL • Fizik TINGKATAN 5

Belauan Gelombang
1.4 Diffraction of Waves

Pembelauan gelombang / Diffraction of waves

Selepas belauan berlaku: / After diffraction has occured:
Definisi / Definition
Dimalarkan / Constant Berubah / Change
Penyebaran gelombang apabila gelombang
melalui celahan atau halangan. • Panjang gelombang, λ • Amplitud berkurang
The spreading of waves as they pass through Wavelength, λ Amplitude decreases
an aperture or obstacle.
• Frekuensi, f • Corak gelombang
Frequency, f Pattern of the wave UNIT 1
• Halaju,v • Tenaga berkurang
Speed, v Energy decreases

Gelombang air lebih terbelau jika:
Waves are diffracted more if:
(i) Celahan sempit / Slit is narrow (ii) Panjang gelombang lebih panjang / Wavelength is longer
Size celahan ≤ λ / Size of gap ≤ λ Halangan panjang / Long obstacle

Video
Saiz celahan > λ / Size of gap > λ Halangan pendek / Short obstacle

Pembelauan Gelombang
Diffraction of Waves
https://goo.gl/eHTMDA

Faktor-faktor mempengaruhi kesan belauan gelombang: / Factors affecting the effects of diffraction of waves:

Faktor Perubahan ke atas faktor Kesan belauan
Factor Changes on factors Effects of diffraction

Saiz celah Kecil / Small Jelas / Clear
Size of slit
Besar / Large Kurang jelas / Less clear
Kecil / Small Jelas / Clear
Saiz halangan
Size of obstacle Besar / Large Kurang jelas / Less clear

Frekuensi Rendah / Low Jelas / Clear
Frequency Tinggi / High Kurang jelas / Less clear
Pendek / Short Kurang jelas / Less clear
Panjang gelombang
Wavelength Panjang / Long Jelas / Clear

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