What is the difference between radio frequency radiation and microwave radiation?
Radio frequency radiation covers a range of frequencies (from about 10,000 Hz to 1,000,000,000,000 Hz or 1 million MHz) of which microwave radiation is one type. Cellular telephones operate in the microwave frequency range (about 800 MHz – 2,100 MHz). AM/FM radios, and VHF/UHF TVs operate at lower radio frequencies than cellular phones, while microwave ovens, radar, and satellite-stations operate at higher radio frequencies than those used for cellular phones. 17. What are some of the differences between the types of brain tumors? Primary brain tumors are tumors that arise in the brain, unlike tumors that begin elsewhere in the body and then spread to the brain. They are classified by the type of cell in which they develop. The most common brain tumors are gliomas. Gliomas develop in the glialcells which make up the soft, spongy tissue that supports the nerve cells in the brain. There are several types of gliomas. One type, astrocytoma, arises from small, star-shaped cells called astro
