Question

A microwave oven cooks food with microwaves of wavelength 14.9 cm. What is the frequency of these microwaves?

Answer 1

We know that c= f$\lambda$

We have c = speed of light= 3 ×10⁸ m/sec

$\lambda$ = 11.8cm = 11.8 × 10^-2 m

Thus f = c/$\lambda$

f = 3×10⁸ /11.8×10^-2 s^-1

^{f = 2.54 × 10⁹Hz}