Question

hotspots in a microwave oven are caused by the formation of standing waves within the cooking chamber. What is the separation between hotspots in a 2.45 GHz microwave oven?

Answer 1

Answer:

0.122 m

Explanation:

We can imagine the hotspots in the microwave oven to correspond to the crests of the waves, so the distance between two hotspot is just the wavelength of the waves.

The wavelenght of an electromagnetic wave is given by

$\lambda=\frac{c}{f}$

where

$c=3.0\cdot 10^8 m/s$ is the speed of light

f is the frequency of the wave. In this case,

$f=2.45 GHz = 2.45 \cdot 10^9 Hz$

so the wavelength is

$\lambda=\frac{3\cdot 10^8 m/s}{2.45\cdot 10^9 Hz}=0.122 m$