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Tunnel Effect

From Wikipedia : Quantum tunneling or tunneling refers to the quantum mechanical phenomenon where a particle tunnels through a barrier that it classically could not surmount. This plays an essential role in several physical phenomena, such as the alpha decay and the nuclear fusion that occurs in main sequence stars like the …

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Particles in the Mist

Which particles can be seen in the cloud chamber ? Since the principle of operation is based on the ionization caused by the passage of the particle, it results that the higher the ionization capacity and the greater the visibility of the trace. Alpha particles produce short and fairly wide …

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Cloud Chamber

See the nuclear particles is possible! With a little patience, at PhysicsOpenLab we have built a cloud chamber, a tool that allows, for example, to reveal the traces of cosmic rays that are continually “raining” on Earth, coming from the remote regions of the universe. A cloud chamber is nothing more …

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Si-PIN Photodiode β Detector

A PIN diode (p-type, intrinsic, n-type diode) is a diode with a wide region of intrinsic semiconductor material (undoped) contained between a p-type semiconductor and an n-type semiconductor. The advantage of a PIN diode is that the depletion region exists almost completely within the intrinsic region, which has a constant …

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Cathode Ray Tube Experiments

A Crookes tube is an early experimental electrical discharge tube, with vacuum, invented by English physicist William Crookes and others around 1869-1875, in which cathode rays, streams of electrons, were discovered. Developed from the earlier Geissler tube, the Crookes tube consists of a partially evacuated glass bulb of various shapes, with two …

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The Rutherford-Geiger-Marsden Experiment

What made by Rutherford and his assistants Geiger and Marsden is perhaps one of the most important experiments of nuclear physics. The experiments were performed between 1908 and 1913 by Hans Geiger and Ernest Marsden under the direction of Ernest Rutherford at the Physical Laboratories of the University of Manchester. …

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Smart Materials : Ferrofluids & Magnetic Levitation

A ferrofluid is a material that belongs to the category of nanostructured materials: it is actually a colloidal solution containing ferromagnetic nanoparticles. For this characteristic it behaves like a magnet, but a liquid magnet! From Wikipedia : a ferrofluid is a liquid that becomes strongly magnetized in the presence of a magnetic …

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ECG with Theremino

With Theremino, with the component AD8232 and the software SignalScope you can easily build a small amateur electrocardiograph. In this post we will describe this equipment and show some examples of the charts that can be obtained. Electrocardiogram In general terms, the electrocardiogram is a graphic representation of the electrical activity …

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Statistics of Radiation Counting

Introduction A typical situation in which comes in the Poisson distribution is the study of a process of radioactive decay. In this circumstance, the number of trials is made by the number of nuclei that potentially may decay and is very large (for one mole of radioactive material the number …

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Backscattering of Beta Particles

Introduction When a β-particle (energetic electron from nuclear decay) enters a material its path can be deflected when it interacts with the nuclei of the material. The β-particles are oppositely charged to the positively charged nucleus and thus an attractive force exists between the two. The deflections that result are dependent …

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