👉 In physics, "ephydrid" is a type of electromagnetic radiation that has been observed to have a frequency between 2.45 x 10^8 Hz and 2.79 x 10^8 Hz, and it has a wavelength around 300 nm. This type of radiation is known as radiofrequency (RF) or microwave radiation. RF and microwave radiation are important for many applications in electronics, such as communication, medical imaging, and industrial