Final answer:
The frequency of the stroboscope's flashes is calculated using the reciprocal of the period, resulting in a frequency of 12500 Hz.
Step-by-step explanation:
The frequency of the flashes from a stroboscope can be calculated using the formula frequency (f) = 1 / period (T), where the period is the time taken for one complete cycle (or in this case, one flash). The period given is 8.00 × 10⁻⁵ s. To find the frequency, we take the reciprocal of the period:
f = 1 / T = 1 / (8.00 × 10⁻⁵ s) = 1.25 × 10⁴ Hz or 12500 Hz, which corresponds to option (a).