Microwaves travel at the speed of light. They go 186,282 miles per second. That is pretty fast if you were to ask me.
Microwaves have frequencies ranging from 0.3 to 300 GHz.
Greenrobby’s answer is only partially correct. Microwaves travel at the speed of light in air or vacuum, however, as they enter a medium such as water their wavelength decreases, but the frequency stays the same, so the speed of the wave decreases. For example, the free-space wavelength of the microwaves from your microwave oven is 12.2 cm, but in water at room temperature the wavelength is only 1.38 cm, so, while in air the microwaves travel 2,450,000.000 x 12.2 cm = ~ 30,000,000,000 cm in one second, in water they can only travel 2,450,000,000 x 1.38 = ~ 3,381,000,000 cm, so their speed is only about 0.113 that of light, or microwaves in air or vacuum.
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