LEARNING RESOURCES
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Radioactivity
The activity of a sample of a radioactive substance is the number of nuclei which disappear per unit of time and represents the speed of decay.
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Quantum tunnelling
If we had particles between two barriers of potential, but of finite size, there could be diffraction on the other side of the barrier; this phenomenon is called the tunnelling effect.
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Quantum potential well
We cannot give any value to the energy of the particle. Its wavelength must "fit" in the well, the same way the harmonics of the musical notes on a guitar must adjust to the length of their strings.
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Quantum atom
Electron in quantum atom (atomic orbitals).
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Pressure and walls
Any body submerged in a fluid is subject to many small forces acting on each face. Force acting on the walls of a submerged object
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Pressure and depth
Hydrostatic pressure varies with depth and the density of the liquid. In this visual and using a somewhat strange receptacle, you can verify this equation
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Pressure: what is it?
Pressure Concept
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Power (II)
Power measures the speed with which work is done. It is measured in watts, W, in the International System of Units. The following visual will help you to understand this concept more clearly as you see the work done by a jack to lift a car.
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Power (I)
The speed with which work is done is called power. To lift the same object to the top implies carrying out the same amount of work. To lift it at a different speed, implies using a different amount of power.
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Power switch
The power switch is one of the elements of a consumer unit.
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Potential energy
The educational resource shows a visual about the potential energy: two balls are on the point of falling, they possess gravitational potential energy. When they reach the snow they will modify their state. What will this depend on?
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Plasma
The atoms are usually neutral state. The agitation of a gas increases when it absorbs heat. If enough heat is absorbed, electrons are stripped from atoms and matter is ionized, saying that it is in plasma state.
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Photovoltaic cell
Light behaves in two ways: like a particle and like a wave. The way a photoelectric cell works shows the corpuscular behaviour of light.
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Phosphorescence
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.
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Petroleum
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.
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Period and frequency
Relation between the magnitude frequency and the magnitude period
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Ohm's law (II)
Concept of Ohm's law
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Nuclear fusion
Concept of nuclear fusión
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Nuclear stability
Concept of nuclear stability
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Nuclear fission
Concept of nuclear fission
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