Answer:
20\(s^{-1}\)
Solution:
We Know that frequenency is defined as the number of times something happens within a specific period of time.
Frequency is related with time by following formula
Frequency=\(\frac{1}{T}\)
Here T is time period=.05
Therefore,
Frequency=\(\frac{1}{.05}\)
Frequency=20\(s^{-1}\)
