# Malaysia SPM Form 5 Physics: Wave

1.1 Oscillation
1.2 Understanding Wave
1.3 Understanding Wave - Calculation
2.1 Wave Phenomena - Reflection and Refraction
2.2 Wave Phenomena - Difraction and Interference
3.1 Sound Wave

# Electromagnetic Wave - Light II (Calculation)

The SPM Physics Workbook is developed under the One-School.net Free Books Project. The content of this book is strictly follow Malaysia SPM (Sijil Pelajaran Malaysia) syllabus. The aim of this project is to provide a complete electronic supplementary network for students to develop self-learning skills by breaking the spoon-feed rituals and to encourage them to compile educational information from the Internet.

1. In a Young’s Double Slit Experiment to determine the wavelength of a monochromatic light, a slide with slits separation of 0.40mm is used. The figure above shows the interference pattern formed on a screen which is 2.4m away from the slide. What is the wavelength of the monochromatic light?
5 × 10-7 m
6 × 10-7 m
7 × 10-7 m
8 × 10-7 m

2. Double Slits experiment by using same set of apparatus. Find the ratio of the wavelength of light A to the wavelength of light B.
6 : 1
1 : 6
3 : 1
1 : 3

3. A monochromatic light source is used in Young’s double slit experiment. A series of dark and bright fringes is formed on screen placed at a distance of 2m from the two slit. The distance between the two slit is 1.2mm and the distance between two consecutive bright fringes is 1.5mm. Find the wavelength of the monochromatic light.
9 × 10-7 m
8 × 10-7 m
7 × 10-7 m
6 × 10-7 m

4. In Young’s double slits experiment, a red light is propagated though a double slit. Fringes form on a screen that is 3.0m away from the slits. If the distance between four consecutive bright fringes is 2.8mm, what is the separation of the slits? [Wavelength of red light wave = 700nm]
2.4 mm
2.2 mm
2.1 mm
2.3 mm

## Chalenging Question

5. Red monochromatic light falls on a pair of slits, forming fringes 3.5 mm apart on a screen.
What is the separation of the fringes when a violet monochromatic light is used and the slit separation is halved?[Wavelength of red light = 700nm; Wavelength of violet light = 400nm]
4.0 mm
3.8 mm
4.5 mm
4.8 mm

6. Fringes of separation x are observed on a screen 2.00 m from a Young's double slits experiment that is illuminated by yellow light. If a blue light is used instead of yellow light, at what distance from the slits would fringes of the same separation x be observed? [Wavelength of yellow light = 600nm; Wavelength of blue light = 400nm]
2.5.
3.0m
3.5m
4.0m