1.-Un resorte que mide 10 centímetro y al aplicarle una fuerza de 10 N, se estira hasta medir 15 centímetros, cuál sería la constante elástica. AYUDA!!!

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.