Answer to Question #207436 in Molecular Physics | Thermodynamics for Ankush

Question

When a strobe light is turned on it flashes 20.0 times in 3.00 seconds.  What is the frequency of the light?

Answer 1

The frequency (f) of a wave is the number of full wave forms generated per second. This is the same as the number of repetitions per second or the number of oscillations per second. 

Time Period (T) is the number of seconds per waveform, or the number of seconds per oscillation. It is clear that frequency and period are reciprocals. 

In this case,  a strobe light flashes 20 times in 3.0 seconds.. 

That is, the frequency is given as 

$f = \frac{20}{3}$ = 6.66Hz