Page 187 - text book form physics kssm 2020

Chapter 5
Waves
A graph of displacement against time and a graph of SMART INFO
SMART
displacement against distance respectively give information on the
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5.
5.1.51.5
terms related to waves as shown in Figure 5.17. Speed of a wave, v = fλ
can be calculated from the
Graph of displacement against time
information obtained from
a graph of displacement
Displacement / cm against time and a graph of
Period, T
displacement against distance.
Amplitude, A
Information obtained:
Time / s
Period, T Amplitude, A
Period, T
1
Frequency, f = —
T

Graph of displacement against distance

Displacement / cm
Wavelength, λ

Amplitude, A
Distance / cm
Wavelength, λ Information obtained:
Amplitude, A
Wavelength, λ

Figure 5.17 Information of waves that can be interpreted from the graphs

Activity 5.6 CPS

Aim: To interpret graph of waves

Instructions:
1. Work in groups.
2. Study the graph of displacement against time and the graph of displacement against
distance for a wave propagating along a piece of rope.
Displacement / cm Displacement / cm

3 3

0 Time / s 0 Distance / cm
0.75
1.00
0.25
0.25 0.50 0.75 1.00 8 8 16 16 24 24 32 32
0.50
–3 –3

Figure 5.18 Graph of displacement against time Figure 5.19 Graph of displacement against distance
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