The wave equation
3 marks · EasyA sound wave travels in air at a speed of 340 m/s.
(a)[2 marks]
Calculate the wavelength if the frequency is 850 Hz.
(b)[1 mark]
State the unit for wavelength.
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(a) 0.40 m
(b) metre(s) or m
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Uses λ = v / f with correct values.
A1 (a) · 1 mark · Correctly calculates wavelength as 0.40 m.
B1 (b) · 1 mark · States correct unit for wavelength: metre(s) or m.
Worked solution
(a) λ = v / f = 340 m/s / 850 Hz = 0.40 m
(b) The unit for wavelength is metre(s) (m).