J.J. Thomson - Revision history

Ajohnson367 at 17:28, 27 November 2015

2015-11-27T17:28:40Z

← Older revision		Revision as of 13:28, 27 November 2015
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	==Cathode Ray Experiments==		==Cathode Ray Experiments==
	A cathode ray tube is a glass tube with wiring inserted on both ends, and as much air as possible pumped out of it. Cathode rays were discovered to travel in straight lines, just like waves do. Physicists ~~new~~ that the ray had an electric charge, and they were trying to figure out if that electric charge could be separated from the ray.		A cathode ray tube is a glass tube with wiring inserted on both ends, and as much air as possible pumped out of it. Cathode rays were discovered to travel in straight lines, just like waves do. Physicists knew that the ray had an electric charge, and they were trying to figure out if that electric charge could be separated from the ray.

	Thomson had the hypothesis that the ray and charge were inseparable, and designed experiments using a magnetic field to prove this was true. He first built a cathode ray tube with a metal cylinder at the end. The cylinder had slits in it that were attached to electrometers, that could measure electric charges. When he applied a magnetic field across the tube, no activity was recorded by the electrometers. This meant the charge had been bent away by the magnet. This proved his theory that the charge and the ray were inseparable.		Thomson had the hypothesis that the ray and charge were inseparable, and designed experiments using a magnetic field to prove this was true. He first built a cathode ray tube with a metal cylinder at the end. The cylinder had slits in it that were attached to electrometers, that could measure electric charges. When he applied a magnetic field across the tube, no activity was recorded by the electrometers. This meant the charge had been bent away by the magnet. This proved his theory that the charge and the ray were inseparable.

Ajohnson367 at 17:21, 27 November 2015

2015-11-27T17:21:47Z

← Older revision		Revision as of 13:21, 27 November 2015
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	== See also ==		== See also ==

	~~Are there~~ related ~~topics or categories in this wiki resource for~~ the ~~curious reader to explore? How does this topic fit into that context?~~		Properties of matter, including mass and charge, are related to Thomson's work with electrons and the mass spectrometer.

	===Further reading===		===Further reading===
			Thomson, J. J. (June 1906). "On the Number of Corpuscles in an Atom". Philosophical Magazine 11: 769–781. doi:10.1080/14786440609463496. Archived from the original on 19 December 2007. Retrieved 4 October 2008.
	~~Books~~, ~~Articles or other print media on this topic~~		Leadership and creativity : a history of the Cavendish Laboratory, 1871 - 1919

	===External links===		===External links===
			https://www.youtube.com/watch?v=WH-U_qCEzT0
	~~Internet resources on this topic~~		http://www.cambridgenetwork.co.uk/news/cambridge-physicist-is-streets-ahead/

	==References==		==References==
			http://thomson.iqm.unicamp.br/thomson.phphttp://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/atomic-and-nuclear-structure/thomson.aspx
	http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/atomic-and-nuclear-structure/thomson.aspx
	http://www.biography.com/people/jj-thomson-40039		http://www.biography.com/people/jj-thomson-40039
	http://study.com/academy/lesson/jj-thomsons-cathode-ray-tube-crt-definition-experiment-diagram.htmlhttps://explorable.com/cathode-ray-experiment		http://study.com/academy/lesson/jj-thomsons-cathode-ray-tube-crt-definition-experiment-diagram.htmlhttps://explorable.com/cathode-ray-experiment

	[[Category:Notable Scientists]		[[Category:Notable Scientists]

Ajohnson367 at 17:13, 27 November 2015

2015-11-27T17:13:37Z

← Older revision		Revision as of 13:13, 27 November 2015
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	After discovering the electron, Thomson started studying positive rays. Positive rays behaved very differently from cathode rays, and he found that each ray followed its own parabolic path based on its detection on the photographic plate. He reasoned that no two particles would follow the same path unless they possessed the same mass-to-charge ratio. He correctly suggested that the positively charged particles were formed by the loss of an electron (isotopes). This created the field of mass spectrometry, which is still used very heavily today.		After discovering the electron, Thomson started studying positive rays. Positive rays behaved very differently from cathode rays, and he found that each ray followed its own parabolic path based on its detection on the photographic plate. He reasoned that no two particles would follow the same path unless they possessed the same mass-to-charge ratio. He correctly suggested that the positively charged particles were formed by the loss of an electron (isotopes). This created the field of mass spectrometry, which is still used very heavily today.

			[[File:cathoderays.jpg]]
	== See also ==		== See also ==

Ajohnson367 at 17:12, 27 November 2015

2015-11-27T17:12:40Z

← Older revision		Revision as of 13:12, 27 November 2015
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	==Isotopes and Mass Spectrometry==		==Isotopes and Mass Spectrometry==

	After discovering the electron, Thomson started studying positive rays.		After discovering the electron, Thomson started studying positive rays. Positive rays behaved very differently from cathode rays, and he found that each ray followed its own parabolic path based on its detection on the photographic plate. He reasoned that no two particles would follow the same path unless they possessed the same mass-to-charge ratio. He correctly suggested that the positively charged particles were formed by the loss of an electron (isotopes). This created the field of mass spectrometry, which is still used very heavily today.

	== See also ==		== See also ==

Ajohnson367 at 16:57, 27 November 2015

2015-11-27T16:57:01Z

← Older revision		Revision as of 12:57, 27 November 2015
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	[[File:jj.jpeg]]		[[File:jj.jpeg]]


	by: Ann Johnson		by: Ann Johnson

Ajohnson367 at 16:55, 27 November 2015

2015-11-27T16:55:54Z

← Older revision		Revision as of 12:55, 27 November 2015
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	[[File:jj.jpeg]]		[[File:jj.jpeg]]


	by: Ann Johnson		by: Ann Johnson
	==The Main Idea==		==The Main Idea==

Ajohnson367 at 16:55, 27 November 2015

2015-11-27T16:55:23Z

← Older revision		Revision as of 12:55, 27 November 2015
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	==Isotopes and Mass Spectrometry==		==Isotopes and Mass Spectrometry==

	~~Put this idea in historical context. Give~~ the ~~reader the Who, What, When, Where~~, ~~and Why~~.		After discovering the electron, Thomson started studying positive rays.

	== See also ==		== See also ==

Ajohnson367 at 14:12, 26 November 2015

2015-11-26T14:12:16Z

← Older revision		Revision as of 10:12, 26 November 2015
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	http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/atomic-and-nuclear-structure/thomson.aspx		http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/atomic-and-nuclear-structure/thomson.aspx
	http://www.biography.com/people/jj-thomson-40039		http://www.biography.com/people/jj-thomson-40039
	~~https~~://explorable.com/cathode-ray-experiment		http://study.com/academy/lesson/jj-thomsons-cathode-ray-tube-crt-definition-experiment-diagram.htmlhttps://explorable.com/cathode-ray-experiment
	[[Category:Notable Scientists]		[[Category:Notable Scientists]

Ajohnson367 at 14:11, 26 November 2015

2015-11-26T14:11:38Z

← Older revision		Revision as of 10:11, 26 November 2015
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	Thomson then worked to proved that the rays had a negative charge. He did this by attempting to deflect them with an electric field by creating a near perfect vacuum, and by using a positive anode and negative cathode to deflect the rays. The rays were deflected by the negative charge, proving that they contained a negative charge.		Thomson then worked to proved that the rays had a negative charge. He did this by attempting to deflect them with an electric field by creating a near perfect vacuum, and by using a positive anode and negative cathode to deflect the rays. The rays were deflected by the negative charge, proving that they contained a negative charge.
	[[File:cathoderay.~~jpg~~]]		[[File:cathoderay.png]]

	==Isotopes and Mass Spectrometry==		==Isotopes and Mass Spectrometry==

Ajohnson367 at 14:10, 26 November 2015

2015-11-26T14:10:21Z

← Older revision		Revision as of 10:10, 26 November 2015
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	J. J. Thomson discovered the electron in 1897 while performing experiments on electric discharge in a high-vacuum cathode ray tube. He interpreted the deflection of the rays by electrically charged plates and magnets as "evidence of bodies much smaller than atoms." He later suggested that the atom is best represented as a sphere of positive matter, through which electrons are positioned by electrostatic forces.		J. J. Thomson discovered the electron in 1897 while performing experiments on electric discharge in a high-vacuum cathode ray tube. He interpreted the deflection of the rays by electrically charged plates and magnets as "evidence of bodies much smaller than atoms." He later suggested that the atom is best represented as a sphere of positive matter, through which electrons are positioned by electrostatic forces.

	==Cathode Ray==		==Cathode Ray Experiments==
			A cathode ray tube is a glass tube with wiring inserted on both ends, and as much air as possible pumped out of it. Cathode rays were discovered to travel in straight lines, just like waves do. Physicists new that the ray had an electric charge, and they were trying to figure out if that electric charge could be separated from the ray.

			Thomson had the hypothesis that the ray and charge were inseparable, and designed experiments using a magnetic field to prove this was true. He first built a cathode ray tube with a metal cylinder at the end. The cylinder had slits in it that were attached to electrometers, that could measure electric charges. When he applied a magnetic field across the tube, no activity was recorded by the electrometers. This meant the charge had been bent away by the magnet. This proved his theory that the charge and the ray were inseparable.

			Thomson then worked to proved that the rays had a negative charge. He did this by attempting to deflect them with an electric field by creating a near perfect vacuum, and by using a positive anode and negative cathode to deflect the rays. The rays were deflected by the negative charge, proving that they contained a negative charge.
			[[File:cathoderay.jpg]]

	==Isotopes and Mass Spectrometry==		==Isotopes and Mass Spectrometry==
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	http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/atomic-and-nuclear-structure/thomson.aspx		http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/atomic-and-nuclear-structure/thomson.aspx
	http://www.biography.com/people/jj-thomson-40039		http://www.biography.com/people/jj-thomson-40039
			https://explorable.com/cathode-ray-experiment
	[[Category:Notable Scientists]		[[Category:Notable Scientists]