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MODUL • Fizik TINGKATAN 5

Kesan daripada superposisi dua puncak gelombang atau dua lembangan gelombang dari sumber
yang koheren untuk menghasilkan amplitud yang maksimum . / The effect of the superposition of two
wave crests or two waves troughs of coherent source to generate the maximum amplitude.
Interferens
membina Gelombang paduan = 2a Gelombang paduan = 2a
Constructive Resulting wave = 2a Resulting wave = 2a
interference
a a
2a 2a
a a

Kesan daripada superposisi puncak gelombang dan lembangan gelombang dari sumber yang koheren untuk UNIT 1

menghasilkan amplitud sifar . / The effect of superposition of wave crest and wave trough from a
coherent source to produce a zero amplitude
Interferens
memusnah Gelombang paduan = 0
Destructive Resulting wave = 0
interference

Antinod Titik di mana interferens membina terbentuk
Antinode A point where constructive interference occurs
Nod Titik di mana interferens memusnah terbentuk
Node A point where destructive interference occurs

Rajah: / Diagram: Formula Interferens Young: ax
Young’s Interference Formula: λ = D
Garis antinod Garis nod
(Interferens (Interferens
membina) memusnah) x
Antinodal line Nodal line
(Constructive (Destructive
interference) interference)

D
Puncak
Crest
Puncak
Crest
Lembangan S 1 S 2
Trough Lembangan a
S S Trough
1 2
Sumber gelombang
Waves sources
a = Jarak antara dua sumber koheren
Distance between two coherent sources
gelombang amplitud sifar / zero amplitude waves = Panjang gelombang / Wavelength
gelombang puncak maksimum / maximum crest waves x = Jarak antara dua garis nod (atau garis antinod) yang
gelombang lembangan maksimum / maximum trough waves berturutan / Distance between two consecutive nodal
lines (or antinodal lines)
D = Jarak berserenjang dari dua sumber ke titik pengukuran x
Perpendicular distance from the two sources to the point
of measurement of x

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