The wave equation
3 marks · EasyA radio wave travels at 3.0 × 10 m/s. The wavelength is 1500 m.
(a)[2 marks]
Calculate the frequency of the radio wave.
(b)[1 mark]
State whether this wave is an example of an electromagnetic or a sound wave.
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(a) 2.0 × 10^5 Hz
(b) Electromagnetic
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Marking points
M1 (a) · 1 mark · Uses f = v / λ with correct values.
A1 (a) · 1 mark · Correctly calculates frequency as 2.0 × 10^5 Hz.
B1 (b) · 1 mark · States correctly that it is an electromagnetic wave.
Worked solution
(a) f = v / \( \lambda \ ) = (3.0 × 10^8 m/s) / (1500 m) = 2.0 × 10^5 Hz
(b) A radio wave is an electromagnetic wave.