What is the linear velocity in miles per hour of the tip of a lawnmower blade spinning at 2200 revolutions per minute in a lawnmower that cuts a path that is 26 inches wide?

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)