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With the stro...

Question

With the stroboscope, synchronism has been obtained at the flashing rates of 25 and 20 pulses per second. The speed of rotation is

A

0.6 rev/min

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B

50 rev/min.

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C

100 rev/min.

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D

6000 rev/min.

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Solution

The correct option is C 100 rev/min.
$Speed of rotation = \frac{f_{1} f_{2}}{(f_{1} - f_{2})}$

$= \frac{25 \times 20}{25 - 20} = 100 r e v / s e c$

$= 6000 r e v / m i n$

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