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developed the first parabolic solar collector. He designed a new collector, which concentrated the rays of sunlight from all sides of absorber. He experimented with a water-filed container enclosed in glass [...] the conical mirror and implemented in cooker in 1870’s. Parabolic mirror concentrate the reflected rays of sun light to a point and cone concentrate light to a line. Mou- chot found out that cone mirror

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• Mouchot and the solar cooker

years old, and she started working with her mother in military hospitals where they operated the X-ray ma- chines, an innovation to surgery that saved a lot of lives of wounded soldiers. At the same time

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• Joliot-Curie and artificial radioactivity

Particularly the analysis of cathode rays appeared to be very promising; among the researchers working in this field was J.J. Thomson. Thomson analyzed these cathode rays and established that they are formed [...] experiments in which he used different cathode materials to emit the rays (which were basically emitted by heating up the cathode, the rays were then accelerated with an electric field). Thomson could show [...] due to Röntgen’s demonstration of the X-rays) opened a new field. Yet, this field was not entered immediately by Becquerel himself or other scientists, but the rays emitted from Uranium salts were just

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• Joliot-Curie and artificial radioactivity

(1974). Ernest Rutherford and the Atom. London: Priory Press Limited. Niaz, M. (1998). From cathode rays to alpha particles to quantum of action: A rational reconstruction of structure of the atom and its

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• Rutherford’s Nuclear Atom

2004). Particularly, the analysis of cathode rays appeared to be promising. Among the researchers working in this field was J. J. Thomson. He analyzed cathode rays and established that they were formed by [...] due to Röntgen’s demonstration of X-rays. His discov- ery opened a new scientific field, which was not entered immediately by him or other scientists since the rays emitted from uranium salts were merely [...] ly, the α-rays turned out to be nuclei of helium, an element that, until then, had been detected only in the sun with spectroscopic methods and seemingly did not exist on Earth. That α-rays were positive

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• Maria Skłodowska-Curie: discoverer of two radioactive elements
• Joliot-Curie and artificial radioactivity
• Rutherford’s Nuclear Atom
• Dalton and the atoms
• Lavoisier and the conservation of mass
• Democritus and the atoms

the J.J. Thompson’s atomic model and the Rutherford’s atomic model. 3. Design the courses of the a rays in the J.J. Thompson’s atomic model and the Rutherford’s atomic model. 4. Locate the differences between

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• Rutherford’s Nuclear Atom

Particularly the analysis of cathode rays appeared to be very promising; among the researchers working in this field was J.J. Thomson. Thomson analyzed these cathode rays and established that they are formed [...] experiments in which he used different cathode materials to emit the rays (which were basically emitted by heating up the cathode, the rays were then accelerated with an electric field). Thomson could show [...] due to Röntgen’s demonstration of the X-rays) opened a new field. Yet, this field was not entered immediately by Becquerel himself or other scientists, but the rays emitted from Uranium salts were just

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• Rutherford’s Nuclear Atom

Particularly the analysis of cathode rays appeared to be very promising; among the researchers working in this field was J.J. Thomson. Thomson analyzed these cathode rays and established that they are formed [...] experiments in which he used different cathode materials to emit the rays (which were basically emitted by heating up the cathode, the rays were then accelerated with an electric field). Thomson could show [...] due to Röntgen’s demonstration of the X-rays) opened a new field. Yet, this field was not entered immediately by Becquerel himself or other scientists, but the rays emitted from Uranium salts were just

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• Democritus and the atoms

it can be seen in the sketch above. The mass of the bottle with its content is 205 gr. When the sun rays are focused on the phosphorus, the phosphorus is set on fire. The white smoke that is produced dissolves

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• Lavoisier and the conservation of mass

Particularly the analysis of cathode rays appeared to be very promising; among the researchers working in this field was J.J. Thomson. Thomson analyzed these cathode rays and established that they are formed [...] experiments in which he used different cathode materials to emit the rays (which were basically emitted by heating up the cathode, the rays were then accelerated with an electric field). Thomson could show [...] due to Röntgen’s demonstration of the X-rays) opened a new field. Yet, this field was not entered immediately by Becquerel himself or other scientists, but the rays emitted from Uranium salts were just

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• Lavoisier and the conservation of mass