posted by sara ..help plz someone .
The frequency of the electromagnetic waves in a microwave oven is 2.2 GHz.
A large piece of cake is placed inside this microwave oven without the rotating plate, and left to cook for a while.
Once the cake is cut, the distance between adjacent uncooked points is closest to ...
1/2 of the microwave wavelength. That is the distance between nodes of the standing wave pattern.
For the wavelength, use the equation
wavelength = c/frequency