$Windows.~BT, should i delete this folder ? I was thinking of deleting this folder so called $Windows.~BT . I know it contains the log regarding then failure of windows update. I want to know what more does this folder contains and will it be ok to delete it coz it is taking up almost 8 Gb of space on my disk .
This means that they have to have some sort of matter to travel through. These waves travel when molecules in the medium collide with each other passing on energy. One example of a mechanical wave is sound. Sound can travel through air, water, or solids, but it can't travel through a vacuum. It needs the medium to help it travel. Other examples include water waves, seismic waves, and waves traveling through a spring. Electromagnetic waves are waves that can travel through a vacuum (empty space). They don't need a medium or matter. They travel through electrical and magnetic fields that are generated by charged particles. Examples of electromagnetic waves include light, microwaves, radio waves, and X-rays.
The two fields are perpendicular to each other and to the direction of travel of the wave. Each vibrates at the same frequency - the frequency of the wave. The waves all travel at the same speed in a vacuum - 2.998x108 ms-1.