Recent content by ppt

why do the medias have such properties?

Why will total internal reflection occur when angle of incidence is greater than the critical angle? Anything deal with the particles?

why is 0.999... = 1? it's contradict to our logic...

Why can the oscillating current discharge energy? Why is the energy in the form of radio waves?

I understand spark was just a "side effect". I need to make clear one question first. Is there a electromagnetic field already(in the setup)? If yes, Then why can and the process of 'making a spark' produce a strong electro-magnetic wave?

Hertz produce radio wave when he made an electric spark. Why is that spark neccessary?

Use water waves as examples. Put something in the water. When you produce a wave, refraction will occur on above the 'something'. But why the frequency in both shallower and deeper part is the same? In addition, the wavelength in the shallower part reduce. Does this means the engery of the...