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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

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

contained radiant heat which had its larg- est intensity beyond the red part of the spectrum. 1 These ‘new rays’ became an issue of investiga- tion for several researchers, most namely John Leslie who published [...] Kingston, Ontario), pp 495-505. Herschel, W. (1800). Experiments on the Refrangibility of the invisible Rays of the Sun. Philosophical Transactions of the Royal Society 90, 284-292. Joule JP (1850): On the

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• The hard work of experimenting James Prescott Joule, William Thomson, and the mechanical equivalent of heat.
• Mouchot and the solar cooker
• Rumford and calorics

contained radiant heat which had its larg- est intensity beyond the red part of the spectrum. 1 These ‘new rays’ became an issue of investiga- tion for several researchers, most namely John Leslie who published [...] Kingston, Ontario), pp 495-505. Herschel, W. (1800). Experiments on the Refrangibility of the invisible Rays of the Sun. Philosophical Transactions of the Royal Society 90, 284-292. Joule JP (1850): On the [...] 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

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• Mouchot and the solar cooker

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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• Dalton and the atoms