Hello,
I was reading articles about EMR and health and I realized I never got how "output power" is related to frequency.
Let's talk about energy, the rule is: the higher the frequency (shorter wavelength) the higher is the energy transported by the wave.
Now power, power is the energy consumed in a certain period of time. But that contradicts (at least in my mind :D) the definition of energy/frequency.
Take a Wi-fi signal vs a microwave oven for example, they both operate on similar frequencies (2.4Ghz) but one has an output of about 200mW and the other up to 1KW :| So if the microwave oven has this amount of power it means that it also carries a lot more energy than Wi-fi, but how does WiFi carry such a lower energy at that high frequency, so the question is how do you control the output power ? (1)
Also, it's been demonstrated that gamma and X-rays do damage human tissues, what I don't understand is: is the wavelength related to it being dangerous or is the power also part of it? (2) Considering that I can send waves with different power what is it more dangerous a AM radio wave of 1MW of a x-ray of 1mW? :D (3)
Lastly, the spacing related to energy. 3G (UMTS Cellular technology ) usually operates on 900 Mhz and 2100Mhz with a spacing (or width) of 5Mhz for each block. I know that 5Mhz is always 5Mhz but why do they need the same amount of width to carry the same datarate if those "5mhz" carry more information in higher frequency of the spectrum? (4)
I was reading articles about EMR and health and I realized I never got how "output power" is related to frequency.
Let's talk about energy, the rule is: the higher the frequency (shorter wavelength) the higher is the energy transported by the wave.
Now power, power is the energy consumed in a certain period of time. But that contradicts (at least in my mind :D) the definition of energy/frequency.
Take a Wi-fi signal vs a microwave oven for example, they both operate on similar frequencies (2.4Ghz) but one has an output of about 200mW and the other up to 1KW :| So if the microwave oven has this amount of power it means that it also carries a lot more energy than Wi-fi, but how does WiFi carry such a lower energy at that high frequency, so the question is how do you control the output power ? (1)
Also, it's been demonstrated that gamma and X-rays do damage human tissues, what I don't understand is: is the wavelength related to it being dangerous or is the power also part of it? (2) Considering that I can send waves with different power what is it more dangerous a AM radio wave of 1MW of a x-ray of 1mW? :D (3)
Lastly, the spacing related to energy. 3G (UMTS Cellular technology ) usually operates on 900 Mhz and 2100Mhz with a spacing (or width) of 5Mhz for each block. I know that 5Mhz is always 5Mhz but why do they need the same amount of width to carry the same datarate if those "5mhz" carry more information in higher frequency of the spectrum? (4)