A) Second
B) \[\text{Secon}{{\text{d}}^{\text{-1}}}\]
C) Metre
D) \[\text{Metr}{{\text{e}}^{-1}}\]
Correct Answer: B
Solution :
Frequency = 1/time period. \[=1/\text{unit}\,\text{of time = secon}{{\text{d}}^{-1}}\]
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