A microwave oven normally produces a microwave frequency emission (wave) to heat up the food, and the wave inside the microwave oven forms a standing wave pattern from the emitter in the same manner as that set up in a stretched string. The rotating plate inside the microwave is taken out and a long chocolate bar is placed inside the microwave. After 30 seconds of heating, two locations of the chocolate bar are melted significantly, and the distance between these 2 melting points is 6 cm. Maximum heating occurs at the antinodes of such a standing wave. What is the wayelength of the microwave?