Frequency is inversely proportional to Wavelength. While time is constant, the number of cycles per second can be varied, and thus the frequency of a wave is increased, and this reduces the length of the cycle. This way, the frequency is inversely proportional to wavelength.
When the frequency goes in Mega cycles or Mega Hertz, which is number of cycles in the millions, the wavelength naturally comes down to microns, and this is what is called microwaves. Microwaves have popular uses in a microwave oven, but if you don’t realize it, you should know that it is there on your mobile phones too, the piece of plastic that you hold close to your ears (and your brains) to talk to other people.
The microwave oven emits a concentrated wave of 800 watts to 1000 wats with a frequency of 2.4 Ghz, the frequency that makes water resonate and produce heat and cook food. But the frequency band that we use on our phones are equally bad too They won’t cook your brains like the microwave oven does as it certainly doesnt have 800 watts of power or the exact frequency that could make the water resonate, but in the long run, it certainly could do some damage to you.
If you have got so used to cellphones in the last 10 years, try to use a handsfree at the least. Constant exposure to even such smaller amouts of radiation could cause mutation and you could be passing doewn bad genes to your next generation.