Answer to Question 2

Back

(a) f = c/l = 3.0 108 m s-1 247 m = 1.2 106 Hz

(b) l = c/f = 3.0 108 m s-1 2.0 1013 Hz = 1.5 10-5 m.  This is in the microwave region.

Answers should be to 2 significant figures.