Page 189 - text book form physics kssm 2020

Chapter 5
Waves
Activity 5.7

Aim: To determine the wavelength, frequency and wave speed
Apparatus: Ripple tank and its accessories, digital xenon stroboscope and ruler
Materials: Distilled water
Plane dipper er
Instructions: Plane dipp
D
1. Arrange the apparatus as in Photograph 5.6. Digital xenonigital xe
stroboscopeo
strobosc
2. Switch on the plane dipper and adjust the frequency of
the digital xenon stroboscope so that the image on the
screen looks stationary.
3. Use a ruler to measure the wavelength of the water
wave, that is the distance between two consecutive
bright fringes.

Discussion: Photograph 5.6
1. What is the frequency of the water wave?
2. What is the wavelength of the water wave?
3. What is the wave speed? Note: If there is no digital
xenon stroboscope, handheld
stroboscope can be used.

Formative Practice 5.1
5.1

1. Figure 5.20 shows a graph of displacement against time for a wave.
Displacement / cm

3
0 Time / s
0.2 0.4 0.6 0.8
–3

Figure 5.20
(a) What is meant by amplitude?
(b) Determine the period of oscillation, T. Th en, calculate the frequency of oscillation.

2. Compare and contrast progressive wave and stationary wave.

3. Figure 5.21 shows a slinky spring being moved Hand movement
forward and backward at one of its ends.
(a) What type of wave is produced by a
slinky spring?
10 cm
(b) Mark “X” at the rarefaction part of the wave
in Figure 5.21. Figure 5.21
(c) What is the wavelength, λ of the wave?

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5.1.6
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