the period for 12 successive crest view, if the time for 20 revolution of stroboscope 15(s)?
To determine the period for 12 successive crest views, we need to find the time it takes for one complete revolution of the crest.
Given that the time for 20 revolutions of the stroboscope is 15 seconds, we can calculate the time it takes for one revolution by dividing the total time by the number of revolutions.
Time for one revolution = Total time / Number of revolutions
Time for one revolution = 15 seconds / 20 revolutions
Time for one revolution = 0.75 seconds
Now that we have the time it takes for one revolution, we can find the period for 12 successive crest views. The period represents the time it takes for one complete cycle of a wave, which in this case is 12 crest views.
Period = Time for one revolution * Number of crest views per period
Period = 0.75 seconds * 12 crest views
Period = 9 seconds
Therefore, the period for 12 successive crest views is 9 seconds.