A) 6 Hz
B) 8 Hz
C) 5 Hz
D) none of these
Correct Answer: C
Solution :
Frequency is the measurement of the number of times that a repeated event occurs per unit time. \[\therefore \] \[\text{Freqency = }\frac{\text{no}\text{.of vibrations}}{\text{time}}\] \[=\frac{2}{0.4}=5\,\text{Hz}\]
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