If a Cordless Phone Operates at a Frequency of 9 $\times$

Multiple Choice

If a cordless phone operates at a frequency of 9.00 $\times$ 10⁸ s^-1.What is the wavelength of this radiation?

A) 0.333 m
B) 1.99 $\times$ 10^-25 m
C) 3.33 $\times$ 10^-9 m
D) 3.71 $\times$ 10^-18 m
E) 2.70 $\times$ 10¹⁷ m