Noting cloudiness occurs when two solutions are mixed.
The sun <u><em>appears</em></u> brighter than any other star.
(It isn't really, but it looks that way because it's much much much much much much closer to us than any other star.)
Answer:

Explanation:
As we know by radioactivity law

so here we will have


now we will have


now we also know that



In a surface wave (like water) the water goes up and down, but the wave travels across (parallel to) the surface.