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MODUL • Fizik TINGKATAN 5

Eksperimen / Experiment
Interferens gelombang cahaya / Interference of light wave

Inferens Jarak antara dua pinggir cerah yang berturutan bergantung kepada panjang gelombang cahaya
Inference The distance between two consecutive bright fringes depends on the wavelength of the light waves.

Hipotesis Jarak antara dua pinggir cerah yang berturutan bertambah apabila panjang gelombang cahaya bertambah
Hypothesis The distance between two consecutive bright fringes increases when the wavelength of the light waves increases.

Tujuan Mengkaji hubungan antara panjang gelombang cahaya dan jarak antara dua pinggir cerah yang berturutan
eksperimen To investigate the relationship between the wavelength of light waves and the distance between two consecutive
Aim of the
experiment bright fringes.

Pemboleh ubah dimanipulasikan / Manipulated variable:
UNIT 1
Panjang gelombang cahaya laser, λ
The wavelength of the laser light waves, λ
Pemboleh ubah bergerak balas / Responding variable:
Pemboleh ubah Jarak antara dua pinggir cerah berturutan, x
Variables
The distance between two consecutive bright fringes, x
Pemboleh ubah dimalarkan / Constant variable:
Jarak pemisahan antara celah, a, dan jarak antara dwicelah dan skrin, D
Slit separation, a, and the distance between double slit and screen, D

Senarai bahan
dan radas Sumber cahaya laser, skrin, dwicelah, pembaris meter dan pembaris 15 cm
List of apparatus Laser light source, screen, double slit, metre ruler and 15 cm ruler
and materials

Skrin
Screen

Susunan radas
Arrangement of the
apparatus Sumber cahaya laser a Kawasan interferens
Laser light source Interference area
Slit dwicelah
Double slit Corak pinggir interferens
3.0 m Interference fringe pattern
D

1. Sumber cahaya laser dihidupkan. Panjang gelombang = λ,
The laser light source is switched on. Wavelength = λ,
2. Corak interferens terbentuk di atas skrin diperhatikan dan dilakarkan.
The interference pattern formed on the screen is observed and drawn.
3. Dengan menggunakan pembaris 15 cm, jarak merentasi 6 pinggir cerah yang berturutan, L diukur dan
Prosedur direkodkan. / By using a 15 cm ruler, the distance across 6 consecutive bright fringes, L is measured and recorded.
Procedure L cm
4. Jarak antara dua pinggir cerah yang berturutan dikira, x = 5
L cm
The distance between two consecutive bright fringes, x = is calculated.
5
5. Eksperimen diulangi dengan sumber laser yang berbeza supaya panjang gelombang = λ 2, λ 3, λ 4, λ 5.
The experiment is repeated with different laser light sources so that the wavelength = λ 2, λ 3, λ 4 , λ 5.

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