# 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

# Phenomena of Wave 2 - Difraction and Interference

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. What is diffraction?

 Diffraction is a change in the direction of the waves. Diffraction is an increase in the speed of the waves. Diffraction is the spreading of the waves when it passes through an aperture or round a small obstacle.

2. The effect of diffraction of a wave increases as the

wavelength of the wave increases.
wavelength of the wave decreases.
speed of the wave increases.
speed of the wave decreases.

3. The effect of diffraction of a wave decreases as the

the size of the opening increases.
the size of the opening decreases.
the frequency of the wave increases.
the frequency of the wave decreases.

4. Which of the following properties of a wave will remain unchanged after experiencing diffraction?

I     wavelength
II    frequency
III  amplitude

II and III only
I and II only
I and III only
I, II and III

5. Figure above shows two impulse moving toward each others. If the amplitude of the two impulse are 5cm and 10cm respectively, what is the maximum resultant displacement of the impulse at the instant they coincident with each other?
30 cm
10 cm
5 cm
15 cm

6. Coherent waves are waves that

have same frequency and amplitude
have same frequency
have same amplitude and in phase
have same wavelength and constant “phase difference”

7. Interference of waves is due to

diffraction of coherent wave
diffraction of incoherent wave
superposition of coherent wave
superposition of incoherent wave

8. Constructive interference will happen when

 two waves which is anti-phase superposition with each others. two waves which is anti-phase and have same amplitude superposition with each others two waves which is in phase superposition with each others. two waves which is in phase and have same frequency superposition with each others.

9. Figure above shows an interference pattern of two coherent waves. Which of the positions does constructive interference occur?

Y and Z
W and X
W and Y
X and Z

10. Figure above shows an interference pattern of two coherent water waves. Which of the points among P, Q, R and S are nodes?
P and Q
R and S
P and S
R and Q

11. Two round dippers separated by a distance of 6.0 cm is connected to a vibrator to produce two coherent sources of spherical waves. The distance between the sources and where x is measured is 20.0 cm. If the distance between two successive anti-node lines is 3.0 cm, determine the wavelength for the spherical wave.
0.9 cm
18.0 cm
2.0 cm
9.0 cm