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Simple Harmonic Motion - Multiple Choice Questions

Q16. The displacement (in mm) of the vibrating cone of a large loudspeaker can be represented by the equation x = 10 cos (150t), where t is the time in s. Which line, A to D, in the table gives the amplitude and frequency of the vibrations.
amplitude/mm
frequency/Hz
A
5
10/2
B
10
150
C
10
150/2
D
20
150/2

Look at the equation for displacement - A is the term before the 'cos'. In this case '10' so the amplitude is 10

150 corresponds to 2f

so f = 150/2