Electromagnetic waves always travel at the same speed (299,792 km per second). This is one of their defining characteristics. In the electromagnetic spectrum there are many different types of waves with varying frequencies and wavelengths. They are all related by one important equation: Any electromagnetic wave's frequency multiplied by its wavelength equals the speed of light
Yes that is true. It is important to stay safe because you can’t help someone if you start having a problem too. Don’t put yourself in danger unless you are a medical professional