e. pitch
People speak about "high" and "low" sounds quite unselfconsciously, as though they know that the latter actually have a low frequency-relatively few cycles-and the former a high frequency. The musical term for this quality of sound, which is recognized as pitch. Low pitches (low frequencies) result from long vibrating elements, high pitches from short ones.
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It is important to remember that infrared waves affect the exterior of the food. Heat on the outside of the food then spreads inward through conduction The result is that the outside of the food browns. Microwaves penetrate the item and cook it from the inside out, so browning does not take place.
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