Share to: /   The Chinese make light Work of Payment: The Invention of Paper Money   / Around 650 AD, the emperor of China began to issue paper value tokens for general use.
Answer: No. Mobile phones do not give off sub-atomic (ionizing)  radiation.    Answer: Yes. Mobile phones emit microwave (millimeter to  centimeter range) electro-mag â¦ netic radiation, mostly at frequencies  from 800 to 1800 MHz (1.8 GHz).This is below infrared.nswer: No. Mobile phones do not give off sub-atomic (ionizing)  radiation.    Answer: Yes. Mobile phones emit microwave (millimeter to  centimeter range) electro-mag â¦ netic radiation, mostly at frequencies  from 800 to 1800 MHz (1.8 GHz). This is below infrared.
Signal symbols. At the top of your phoneâs screen you might have seen letters and numbers like G, H+ and 4G. These tell you the speed of internet connection your phone is currently receiving.