The frequencies expressed in inverse seconds are 5 s⁻¹ and 1 s⁻¹.
Frequency is the number of complete cycles in a second made by a wave.
F = 1/T
F = n/t
F = 5/s = 5 s⁻¹ = 5Hz
F = 1/s = 1 s⁻¹ = 1Hz
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