Page 209 - text book form physics kssm 2020

Chapter 5
Waves
Results:

Table 5.4
Characteristic of wave Comparison before and aft er the gap
Wavelength
h

Frequency

Wave speed

Amplitude

Direction of propagation
Figure 5.46
Discussion:
Compare the shape of the incident wavefront with the wavefront that has passed through
the gap.
B Diffraction of light waves
Apparatus: Laser pen, retort stand, single narrow slit, single
wide slit, small sized pin hole, large sized pin hole and
white screen

Instructions: You can also carry out this
1. Set up the apparatus as shown in Figure 5.47. Use a activity using a self-made
single wide slit. adjustable single slit as
shown below.
Retort stand
Screen

Credit card
Credit card
Wide slit
Wide slit
Rubber
Laser pen Rubber
Single slit band Pencil
band
Pencil
Narrow slit
Narrow slit

Figure 5.47
2. Direct the laser light ray through the single slit. Observe Demonstration using self-
the pattern formed on the screen and draw the pattern made adjustable single slit
in Table 5.5.
3. Repeat steps 1 and 2 using:
(a) a single narrow slit
(b) a large pin hole
(c) a small pin hole http://bt.sasbadi.com/p4203

203
203
5.5.1
5.5.1