Microwaves, such as those used for radar and to heat food in a microwave oven, have wavelengths greater than about 3 mm. What is the corresponding frequency of radiation of a wavelength of 13.4 mm? Please answer in units of s-1.
answer : microwave are electromagnetic waves
The wavelength and frequency of light are closely related. The higher the frequency, the shorter the wavelength. Because all light waves move through a vacuum at the same speed, the number of wave crests passing by a given point in one second depends on the wavelength.
for electromagnetic waves = c ---------- (1)
where = 0.0134 m is the wavelength, is the frequency and c = 2.99 * 108 ms-1 is the speed of light.
using equation (1)
= c/
= ( 2.99 * 108 ) /0.0134 = 2.23 * 1010 s-1
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