Phosphorescence is the luminescence produced by a mineral during a more or less long period of time, after the source of exciting radiation has ceased.

Oil is the product of the decomposition of the remains of microscopic living organisms which millions of years ago inhabited the seas, lakes and river estuaries. Oil today has a multitude of applications. This is why is it essential not to waste it simply as fuel. The following visual shows how it is formed and how it is used.

The educational resource shows an interactive animation about the perpetual motion: If such a system were possible, it would be a type of perpetual motion.

Variaciones entre periodo y frecuencia

Relation between the magnitude frequency and the magnitude period

Periodo de semidesintegración: tiempo que tardan en transmutarse la mitad de los átomos radiactivos de una muestra.

Pequeños interruptores automáticos (PIA) o magnetotérmicos que interrumpen la corriente eléctrica cuando hay sobrecarga.

La utilización de la corriente eléctrica conlleva algunos peligros y conviene estar prevenido.

Instrumento de medición electrónico para la representación gráfica de señales eléctricas que pueden variar en el tiempo.

Concepto de orden de magnitud

Concepto ondas estacionarias

Concepto de paradoja relativista

Concepto de paradoja mellizos

The ancient Greeks knew that the parabolic mirrors are paraboloids of revolution which have the property of concentrating the rays at the focus of the paraboloid.

Concepto de onda transversal

Concepto de onda longitudinal

Concept of Ohm's law. The following visual is useful for studying Ohm's Law.

Concept of Ohm's law

Observation concept

Concept of nuclear fusión