Question

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 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