Answer:
Frequency = 40 times Time = 4 seconds Frequency in one second \[=\frac{40}{4}=10\]time Time \[=\frac{1}{Frequency}\] \[=\frac{1}{10}=0.1\] Seconds \[=\,\frac{1}{Time\,Period\,}=\frac{1}{0.1}=10\,\]
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