

(a) describe what is meant by wave motion as illustrated by vibration in
ropes, springs and ripple tanks. (b) show an understanding and use the terms displacement^{[]}, amplitude, phase
difference, period^{[]}, frequency, wavelength^{[]} and speed. (c) deduce, from the definitions of speed, frequency and wavelength, the
equation
ν = fλ. (d) recall and use the equation ν = fλ. (e) show an understanding that energy is transferred due to a progressive
wave. (f) recall and use the relationship, intensity^{[]} ∝ (amplitude)2. (g) compare transverse and longitudinal waves. * (h) analyse and interpret graphical representations of
transverse and longitudinal waves. (i) show an understanding that polarisation^{[]} is a phenomenon associated with
transverse waves. * (j) determine the frequency of sound using a calibrated
c.r.o. * (k) determine the wavelength^{[]} of sound using stationary
waves. * (l) state that all electromagnetic waves travel with the
same speed in free space and recall the orders of magnitude^{[]} of the wavelengths of
the principal radiations from radio waves to
γrays. 

* (a) explain and use the principle of superposition in
simple applications. * (b) show an understanding of experiments which demonstrate
stationary waves^{[]} using microwaves, stretched strings and air
columns. * (c) explain the formation of a stationary wave using a
graphical method, and identify nodes and antinodes. (d) explain the meaning of the term diffraction. (e) show an understanding of experiments which demonstrate diffraction
including the diffraction^{[]} of water waves in a ripple tank
with both a wide gap and a narrow gap. (f) show an understanding of the terms interference and coherence. (g) show an understanding of experiments which demonstrate twosource
interference using water, light and microwaves. (h) show an understanding of the conditions required if twosource
interference fringes are to be observed. (i) recall and solve problems using the equation λ = ax
/ D for doubleslit
interference using light. (j) recall and solve problems using the formula d sinθ = nλ and describe the use of a diffraction^{[]} grating to determine the wavelength 
