Electromagnetic Waves: Production and Dangers
Electromagnetic waves are created when atoms or their nuclei change energy states. Think of gamma rays shooting out from radioactive atoms, or radio waves being generated by the electrical circuits in your phone when you stream music.
Radio waves work through oscillations in electrical circuits - basically electricity wiggling back and forth really fast. Your TV aerial picks up these waves and converts them back into electrical signals with the same frequency. It's like a wireless electrical connection!
Some EM waves are properly dangerous though. Ultraviolet waves, X-rays and gamma rays can seriously damage your body tissues. We measure this danger using radiation dose in sieverts (Sv) - basically how much risk you're exposed to.
UV rays are sneaky - they make your skin age faster and increase skin cancer risk. X-rays and gamma rays are even worse because they're ionising radiation. This means they can knock electrons off atoms, messing up your DNA and potentially causing cancer. That's why radiographers hide behind lead screens during X-rays!
Key Point: The higher the radiation dose in sieverts, the greater the risk to your health - but don't panic, everyday exposure levels are incredibly low.
