Speed of Light using Marshmallows!!

A few days back, I was warming up my food in the microwave and it was unevenly warm and so i was thinking of trying out some experiment to see if there was some pattern of areas that got heated up quickly and areas that dont... and for this experiment, i thought we should use small cups containing the liquid that is used in the microwaveable cold/heating packs which turn blue when cold and hot when red... but then it needs quite some work done ?

so, i decided to just learn if somebody had tried in the internet and voila!

Uneven heating in the microwave can be attributed to factors like: A fixed pattern of destructive interference of the reflected microwaves, Position of the food (never place at the center?), Composition of the food and the time to cook...

Here are two interesting experiments that i am planning to do this week:

1. Find the pattern in which microwaves interfere in your microwave.
   
2. Find the speed of microwave which is also the Speed of Light by measuring the wavelength of the microwaves by heating a layer of marshmallows!

Ah, the simple pleasures of microwaving... ;-)