Final answer:
The frequency of the light flashes from the stroboscope is 80 Hz, as frequency is the reciprocal of the time interval between flashes, which is 1/80 second.
Step-by-step explanation:
The time interval between flashes on a stroboscope is 1/80 second, you want to know the frequency of the light flashes. The frequency is the number of occurrences of a repeating event per unit time and can be calculated by taking the reciprocal of the time period (T), where the frequency (f) is 1/T. So, if T is 1/80 second, then the frequency f is 80 Hz, since 1/(1/80) equals 80.
Therefore, the correct answer is c. 80 Hz, which means the stroboscope flashes 80 times per second.