Exercise_0
Light and waves
1. The diagram shows waves being produced on a rope.
The waves are not reflected by the wall.
(a) (i) Draw an arrow on the diagram to show the direction in which the waves transfer energy.
(ii) Which one of the arrows, labelled, X, Y or Z, shows the amplitude of a wave?
_____________________________________________________________________________
(iii) Which one of the arrows, labelled, X, Y or Z, shows the wavelength of a wave?
_____________________________________________________________________________
(iv) The waves produced on the rope are transverse.
Name one other type of transverse wave.
_____________________________________________________________________________
(b) The rope is shaken up and down, producing 3 waves every second.
The waves have a wavelength of 1.2 meters.
Calculate the speed of the waves.
Exercise_0
Light and waves
1. White light that shone from the Sun contains the full spectrum of visible light. The light
is scattered when it passes through atmosphere and reaches our eyes.
(a) Why the sky looks blue?
_______________________________________________________________________
_______________________________________________________________________
(b) Why the Sun appears red at sunrise and sunset?
_______________________________________________________________________
_______________________________________________________________________
(c) Why the space outside the atmosphere is dark in colour?
_______________________________________________________________________
(d) Why cloud appears as white?
_______________________________________________________________________
_______________________________________________________________________
(e) Why do clouds turn grey before it rains?
_______________________________________________________________________
______________________________________________________________________