What happens to the speed of an electromagnetic wave as it travels through a vacuum?
goes to a constant value called c, which is 300000000m/s, or 3.0*10^8 m/s
Light is electromagnetic radiation. The speed of light in a vacuum is the speed for all electromagnetic radiation, as long as it is measured in vacuo. When e-m radiation travels through something other than a vacuum, it travels more slowly. How much slower sometimes varies according to the wavelength of the radiation.
The refractive index of air at standard temperature and pressure is 1.00029. Outer space is much more rarefied and so the index is closer to 1 but it is still denser than a total vacuum and so the index is greater than 1. This means that electromagnetic waves with smaller frequencies will travel slower. Thus, blue light will travel slower than red.
Yes heat energy can pass through vacuum. Now a days "vacuum" has been renamed as "free space". Free space also is a medium but non material medium. Through this medium heat energy is transferred in the form of electromagnetic radiations. Certainly. By radiation. The heat from the sun travels to the earth through a vacuum.
Pure light from a source in space, like our sun, has many components. The visible wavelength of light is just one of these. Another component is the electromagnetic wavelength that travels perpendicularly to the visible wavelength. As the first of these waves weaves through the vacuum of space, it propagates its companion wave simultaneously and at 90 degrees. The first wave can then continue forward using the newly created side wave and so on. This…
Space is a vacuum and continuous bombard of bodies in space happens all the time producing light and sound. Light travels through a vacuum but what about sound?
Sound is mechanical energy. It is created in a number of ways, but they are all mechanical in nature. Something (a mass or some material) must move. The mechanical energy of sound is carried by the medium through which it is traveling. The mechanical energy is actually transferred into the medium through which it is going to travel. As such, sound cannot travel through the "nothing" that is space. Light is electromagnetic energy. It's like…