Question

A stroboscope is set to flash every 8.00×10−5s. What is the frequency of the flashes?

Answer 1

Answer:

And so we take 1 flash for every 8.00 times 10 to the minus 5 seconds and this works out to 12.5 times 10 to the 3 flashes per second or you could say 12.5 kilohertz.

Answer 2

The frequency of the flashes of the stroboscope is 1.25 × 10⁴ s⁻¹.

Given:

Time interval after which the stroboscope flashes = 8.00 × 10⁻⁵ sec

To Find:

The frequency of the flashes of the stroboscope.

Solution:

→ The frequency can be said to be the number of occurrences per second.  →For the given question the frequency of the flashes would be equal to the number of flashes per second.

∵ Number of flashes in 8.00 × 10⁻⁵ seconds = 1 flash

∴ The number of flashes (N) in 1 second:  

                             $N = \frac{1}{(8.00)(10^{-5})} (1)=1.25(10^4)s^{-1}$

As 1.25 × 10⁴ s⁻¹ flashings occur in 1 second therefore the frequency of the flashes of the stroboscope is equal to 1.25 × 10⁴ s⁻¹.

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