A microwave oven operates at 2.80GHz . What is the wavelength of the radiation produced by this appliance?

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1. giga means 10^9

so period = 1/f = (1/2.8) * 10^-9 seconds

distance = speed * time
speed = 3 * 10^8 m/s
time = (1/2.8) * 10^-9
so
distance = wavelength = 3*10^8 /2.8 *10^-9
= (3/2.8)*10^-1
= 1.07*10^-1 m = .107 m = 10.7 cm

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