If you have ever wondered why the sky is blue, today we will explain why. Surely you have also noticed that, at dawn and dusk, its tone changes, acquiring more reddish or pink tones. As always, first of all, we should know something more about the Earth's atmosphere, because this together of the light are involved in the color of the sky. The atmosphere is partially composed of gases, among which are oxygen by 21%, carbon dioxide by 0.03% and nitrogen by 78%. But in the atmosphere there are more particles in suspension, such as, for example, water, dust, ash, pollen, etc. The composition of the atmosphere may vary depending on the location and weather conditions, but it is usually more dense in the lower parts, that is, close to the surface of the earth. HEAVEN IS BLUE BY THE DISPERSION OF RAYLEIGH Sunlight, when hitting the components of the atmosphere, communicates energy and makes them vibrate, which causes a wave. It is similar to what happens in a pond after the impact of a stone: a wave is created that is greater the stronger the pact is. In the case of the color of the atmosphere, the key is in the direction that sunlight takes when entering the atmosphere. According to her, the sky can be blue, as usual during the central hours of the day, or rather reddish-orange, like dawn and dusk. According to the theory that Lord Rayleigh developed in 1871, the change in color is due to the scattering of light: the sun's rays hit the molecules of the atmosphere, bounce and deviate again. And blue light is more likely to scatter than red light. Therefore, although the amount of scattered light is very low - around 1% - blue light reaches almost every corner of the sky while the other colors that make up sunlight pass by. And that's why the sky is blue.english team 8
IDENTIDADES TRIGONOMÉTRICAS Las identidades trigonométricas son ecuaciones que involucran las funciones trigonométricas que son verdaderas para cada valor de las variables involucradas. Definiciones de las funciones trigonométricas: coseno, seno, tangente, secante, cosecante y cotangente. Tabla de valores del seno, coseno y tangente de los ángulos usados más frecuentemente. Demostraciones de las identidades trigonométricas más importantes: identidad fundamental, secante al cuadrado, cosecante al cuadrado, seno, coseno y tangente de la suma de ángulos, del ángulo doble, del ángulo mitad, etc. Algunas de las más comúnmente usadas identidades trigonométricas son derivadas del teorema de Pitágoras , como las siguientes: Hay también las identidades recíprocas : Las identidades cocientes : Las identidades co-función : Las identidades pares-impares : Las fórmulas...
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