The cost to buy one movie ticket is $7. if the total cost for the movie is a function of how many people go, then the input is the $7 the number of people going the total cost the movie

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)