I made the experiment up myself so my errors may be a result of this, but I heated up marshmallows, eggs and cheese in the microwave and measured the distance between the hotspots in order to get the wavelengths. For the marshmallows I got 0.13cm, for the eggs I got 0.16cm and for the cheese I got 0.10cm. However when I plugged these into the equation to get dielectric constant: c=(λ)(f)√ε I got marshmallows=0.97, eggs=2.2, and cheese=0.87 and I read somewhere that dielectric constants can't be less than 1. We don't cover dielectric constant in my physics class, and my teacher doesn't know too much about it in relation to food I don't know if it was a flaw in my experiment, if the heat of the microwave or fact that it was food instead of a gas, or maybe that dielectric constants in food follow different guidelines, but if anyone has any idea about this and could just explain where I went wrong I would appreciate it so much! Thanks in advance!