Page 214 - text book form physics kssm 2020

Diff raction of waves is infl uenced by the size of slit and wavelength. Figure 5.52 presents
the eff ects of diff raction of waves.

Eff ects of diff raction of waves

Fixed wavelength Fixed size of slit

Wide slit Narrow slit Short Long
size size wavelength wavelength

Spreading of Spreading of Spreading of Spreading of
waves is less waves is more waves is less waves is more
signifi cant signifi cant signifi cant signifi cant

Figure 5.52 Factors which infl uence diff raction of waves and their eff ects

Diffraction of Waves in Daily Life
Figure 5.53 provides examples of diff raction of water, light and sound waves.

Diff ractions of Waves

Water waves Light waves Sound waves
Diff raction of water waves Holograms produced by eff ects Infrasonic waves produced
produces calm of water regions of diff raction of light are used as by elephants have long
suitable for docking of ships and safety features on bank cards wavelength to facilitate long
water recreational activities. such as debit cards and credit cards distance communication
between elephants.

Embankment barrier
Embankment barrier
123
Gap
Gap

Calm water region
Calm water region

Kok Beach in Langkawi Hologram on a bank card Elephant producing
infrasonic waves

Figure 5.53 Diff raction of water, light and sound waves

208
208 5.5.3 5.5.4
5.5.4
5.5.3