What is the lowest frequency electromagnetic wave ever detected? Theoretically, is there a lower limit?

Answer 1

The lowest frequency that can be detected practically is of the order of 150 kilo cycles / second.

The intensity is proportional to the frequency to the fouth power.

Hence very low-frequency radiation having wavelengths of the order of hundreds of kiometers cannot be traced.

Answer 2

I don't believe there is any lower limit - you can generate any low frequency wave you like. Submarine radio communications are down around 60 Hz, for example.

EDIT: In terms of practicality, the lower the frequency, the longer the antenna. When you get down around the subsonic range, conventional antennas could be miles in length, though other ways exist to alleviate this. Definitely, the lower limit is decades below 150kHz

Answer 3

i have been wondering about this one for a long time i am convinced the u s military knows but i call the receptionist to ask and she has me call the captain and the captain tells me to call the engineer and the engineer tells me to call central and when i do a familiar voice says hello receptionists office. :s

seems the awnser to your question will not be given any beter than it has been here until the world is safe.

i am confident that the wave will cease to oscillate at some point at witch time it may become 2 different particles but would they weigh half as much as the original particle?
(re: refraction and diffraction)

Answer 4

I saw a chart that called DC current 0 Hz.