What is the wavelength of microwaves if the frequency is 2.45x 10^9 HZ?

Wavelength = Speed of Light ÷ Frequency

                     = (2.99 × 10⁸ m/s) ÷ ( 2.45 × 10⁹ /s)

                     = 1.22 × 10⁻¹ m

The wavelength of a light of frequency   2.45 × 10⁹ /s is 1.22 × 10⁻¹ m.

Notes:

Hz ≡ /s

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current