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MODUL • Fizik TINGKATAN 5

2 Rajah menunjukkan corak pinggir yang terbentuk dalam eksperimen dwicelah apabila cahaya monokromatik digunakan. Jarak
antara celah ialah 0.5 mm dan skrin adalah sejauh 3.0 m dari dwicelah itu.
The diagram shows the fringe pattern obtained in a double slit experiment when a monochromatic light is used. The double slits are
KBAT 0.5 mm apart and the screen is 3.0 m away from the double slits.

1.4 cm

Berapakah panjang gelombang cahaya monokromatik itu? / What is the wavelength of the monochromatic light?

Penyelesaian
Solution
UNIT 1
Diberi / Given: λ = ax
a = 0.5 mm = 0.5 × 10 m D
–3
D = 3.0 m (0.5 × 10 m) × (0.28 × 10 m)
–2
–3
1.4 cm = 3.0 m
x =
5 = 4.67 × 10 m
–7
= 0.28 cm
= 0.28 × 10 m
–2

Eksperimen / Experiment Interferens gelombang bunyi / Interference of sound waves

Jarak antara dua kawasan bunyi kuat berturutan bergantung kepada jarak antara pendengar dan dua pembesar
Inferens suara. / The distance between two successive loud regions depends on the distance between the listener and the two
Inference
loudspeakers.

Jarak antara dua kawasan bunyi kuat berturutan bertambah apabila jarak antara pendengar dan dua pembesar
Hipotesis suara bertambah. / The distance between two successive loud regions increases as the distance between the listener
Hypothesis
and the two loudspeakers increases.

Tujuan Mengkaji hubungan antara jarak antara pendengar dari dua pembesar suara dengan jarak antara dua kawasan
eksperimen bunyi kuat yang berturutan. / To investigate the relationship between the distance between the listener and the two
Aim of the
experiment loudspeakers, and the distance between two successive loud regions.
Pemboleh ubah dimanipulasikan / Manipulated variable:
Jarak antara pendengar dan dua pembesar suara, D.
The distance between the listener and the two loudspeakers, D.

Pemboleh ubah bergerak balas / Responding variable:
Pemboleh ubah Jarak antara dua kawasan bunyi kuat yang berturutan, x
Variables
The distance between two successive loud regions, x
Pemboleh ubah dimalarkan / Constant variable:
Panjang gelombang bagi gelombang bunyi / Jarak antara dua pembesar suara
The wavelength of sound waves / Distance between the two loudspeakers

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