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Cathode rays and the cathode rays tube
How do we find the angular, radial nodes and the quantum numbers when the radial probability distribution curve's equation is given?Difference between probability and probability density of finding a particle in spacepositive rays ?? (What and why)How does the screening effect work for orbital in the same shell?How are the molar mass and molecular mass of any compound numerically the same?What is the real structure of atom showing every ORBITALStrong or weak force between protons and neutrons?Why did J.J. Thomson observe protons in his cathode ray experiment?Which principle goes against the concept of Bohr's fixed orbits?How is the potential energy between two atoms measured?
$begingroup$
I got the following extract from a chemistry book (emphasis mine):
It is observed that current does not flow through the gas at ordinary pressure even at high voltage of 5000 volts. When the pressure inside the tube is reduced and a high voltage of 5000–10000 volts is applied, then an electric discharge takes place through the gas producing a uniform glow inside the tube. When the pressure is reduced further to about 0.01 torr, the original glow disappeares. Some rays are produced which create fluorescence on the glass wall opposite to the cathode.
It's about cathode rays discovery in a chapter on atomic structure. Here the author is talking about a uniform glow appearing when the pressure was reduced. Then he says that the rays (which he then refers to as cathode rays) appear after the disappearance of the glow. I have never noticed this glow in any experiment. Does any body know what this is?
atomic-structure
edited 8 hours ago
andselisk♦
21.2k773142
asked 8 hours ago
M ShehzadM Shehzad
111
New contributor
M Shehzad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
I got the following extract from a chemistry book (emphasis mine):
It is observed that current does not flow through the gas at ordinary pressure even at high voltage of 5000 volts. When the pressure inside the tube is reduced and a high voltage of 5000–10000 volts is applied, then an electric discharge takes place through the gas producing a uniform glow inside the tube. When the pressure is reduced further to about 0.01 torr, the original glow disappeares. Some rays are produced which create fluorescence on the glass wall opposite to the cathode.
It's about cathode rays discovery in a chapter on atomic structure. Here the author is talking about a uniform glow appearing when the pressure was reduced. Then he says that the rays (which he then refers to as cathode rays) appear after the disappearance of the glow. I have never noticed this glow in any experiment. Does any body know what this is?
atomic-structure
edited 8 hours ago
andselisk♦
21.2k773142
asked 8 hours ago
M ShehzadM Shehzad
111
New contributor
M Shehzad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
$begingroup$
To close voters, I'm not sure what is unclear about the question. The OP points to a specific phenomena reference in a book (which should ideally have a citation @MShehzad) and it had a relatively straightforward answer.
$endgroup$
– Tyberius
1 hour ago
add a comment |
$begingroup$
I got the following extract from a chemistry book (emphasis mine):
It is observed that current does not flow through the gas at ordinary pressure even at high voltage of 5000 volts. When the pressure inside the tube is reduced and a high voltage of 5000–10000 volts is applied, then an electric discharge takes place through the gas producing a uniform glow inside the tube. When the pressure is reduced further to about 0.01 torr, the original glow disappeares. Some rays are produced which create fluorescence on the glass wall opposite to the cathode.
It's about cathode rays discovery in a chapter on atomic structure. Here the author is talking about a uniform glow appearing when the pressure was reduced. Then he says that the rays (which he then refers to as cathode rays) appear after the disappearance of the glow. I have never noticed this glow in any experiment. Does any body know what this is?
atomic-structure
edited 8 hours ago
andselisk♦
21.2k773142
asked 8 hours ago
M ShehzadM Shehzad
111
New contributor
M Shehzad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I got the following extract from a chemistry book (emphasis mine):
It is observed that current does not flow through the gas at ordinary pressure even at high voltage of 5000 volts. When the pressure inside the tube is reduced and a high voltage of 5000–10000 volts is applied, then an electric discharge takes place through the gas producing a uniform glow inside the tube. When the pressure is reduced further to about 0.01 torr, the original glow disappeares. Some rays are produced which create fluorescence on the glass wall opposite to the cathode.
It's about cathode rays discovery in a chapter on atomic structure. Here the author is talking about a uniform glow appearing when the pressure was reduced. Then he says that the rays (which he then refers to as cathode rays) appear after the disappearance of the glow. I have never noticed this glow in any experiment. Does any body know what this is?
atomic-structure
atomic-structure
edited 8 hours ago
andselisk♦
21.2k773142
asked 8 hours ago
M ShehzadM Shehzad
111
New contributor
M Shehzad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 8 hours ago
andselisk♦
21.2k773142
asked 8 hours ago
M ShehzadM Shehzad
111
New contributor
M Shehzad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 8 hours ago
andselisk♦
21.2k773142
edited 8 hours ago
andselisk♦
21.2k773142
edited 8 hours ago
andselisk♦
21.2k773142
21.2k773142
asked 8 hours ago
M ShehzadM Shehzad
111
New contributor
M Shehzad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
M ShehzadM Shehzad
111
asked 8 hours ago
M ShehzadM Shehzad
111
111
New contributor
M Shehzad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
M Shehzad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$begingroup$
To close voters, I'm not sure what is unclear about the question. The OP points to a specific phenomena reference in a book (which should ideally have a citation @MShehzad) and it had a relatively straightforward answer.
$endgroup$
– Tyberius
1 hour ago
add a comment |
$begingroup$
To close voters, I'm not sure what is unclear about the question. The OP points to a specific phenomena reference in a book (which should ideally have a citation @MShehzad) and it had a relatively straightforward answer.
$endgroup$
– Tyberius
1 hour ago
$begingroup$
To close voters, I'm not sure what is unclear about the question. The OP points to a specific phenomena reference in a book (which should ideally have a citation @MShehzad) and it had a relatively straightforward answer.
$endgroup$
– Tyberius
1 hour ago
$begingroup$
To close voters, I'm not sure what is unclear about the question. The OP points to a specific phenomena reference in a book (which should ideally have a citation @MShehzad) and it had a relatively straightforward answer.
$endgroup$
– Tyberius
1 hour ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
The uniform glow is due to ionization and recombination of the residual gas; it's called a glow discharge. At higher pressure, a spark or arc discharge occurs at much higher current density. Fluorescent lamps and neon lamps operate in the glow-discharge region, and high-pressure xenon lamps use an arc discharge.
Elements of the residual gas can be identified by the color of the glow discharge. Nitrogen and argon in air, for example, glow purplish blue.
As pressure decreases further, density is too low (and path too short) to produce a visible glow discharge, but electrons, AKA "cathode rays", hurled off the electrodes impact the walls of the container, which may glow green in borosilicate glass, and in very low pressure vacuum tubes, such as the 1G3GT high-voltage rectifier, the electrons impacting the anode produce X-rays (high energy photons), which may also create fluorescence in the glass shell.
The difference is easy to see in this video, which demonstrates the change in appearance from an arc discharge to glow discharge, and finally to fluorescence of the glass envelope due to X-rays or electron bombardment. The arc starts at ~20 seconds, the glow discharge at ~26 seconds, striations form ~36 seconds, and by ~46 seconds, the glass envelope glows green from electron bombardment (though it might rathet be the green of residual oxygen). This was one of my favorite demonstrations to show students the basis for spectroscopy!
answered 7 hours ago
DrMoishe PippikDrMoishe Pippik
15.3k1633
$endgroup$
add a comment |
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$begingroup$
The uniform glow is due to ionization and recombination of the residual gas; it's called a glow discharge. At higher pressure, a spark or arc discharge occurs at much higher current density. Fluorescent lamps and neon lamps operate in the glow-discharge region, and high-pressure xenon lamps use an arc discharge.
Elements of the residual gas can be identified by the color of the glow discharge. Nitrogen and argon in air, for example, glow purplish blue.
As pressure decreases further, density is too low (and path too short) to produce a visible glow discharge, but electrons, AKA "cathode rays", hurled off the electrodes impact the walls of the container, which may glow green in borosilicate glass, and in very low pressure vacuum tubes, such as the 1G3GT high-voltage rectifier, the electrons impacting the anode produce X-rays (high energy photons), which may also create fluorescence in the glass shell.
The difference is easy to see in this video, which demonstrates the change in appearance from an arc discharge to glow discharge, and finally to fluorescence of the glass envelope due to X-rays or electron bombardment. The arc starts at ~20 seconds, the glow discharge at ~26 seconds, striations form ~36 seconds, and by ~46 seconds, the glass envelope glows green from electron bombardment (though it might rathet be the green of residual oxygen). This was one of my favorite demonstrations to show students the basis for spectroscopy!
answered 7 hours ago
DrMoishe PippikDrMoishe Pippik
15.3k1633
$endgroup$
add a comment |
$begingroup$
The uniform glow is due to ionization and recombination of the residual gas; it's called a glow discharge. At higher pressure, a spark or arc discharge occurs at much higher current density. Fluorescent lamps and neon lamps operate in the glow-discharge region, and high-pressure xenon lamps use an arc discharge.
Elements of the residual gas can be identified by the color of the glow discharge. Nitrogen and argon in air, for example, glow purplish blue.
As pressure decreases further, density is too low (and path too short) to produce a visible glow discharge, but electrons, AKA "cathode rays", hurled off the electrodes impact the walls of the container, which may glow green in borosilicate glass, and in very low pressure vacuum tubes, such as the 1G3GT high-voltage rectifier, the electrons impacting the anode produce X-rays (high energy photons), which may also create fluorescence in the glass shell.
The difference is easy to see in this video, which demonstrates the change in appearance from an arc discharge to glow discharge, and finally to fluorescence of the glass envelope due to X-rays or electron bombardment. The arc starts at ~20 seconds, the glow discharge at ~26 seconds, striations form ~36 seconds, and by ~46 seconds, the glass envelope glows green from electron bombardment (though it might rathet be the green of residual oxygen). This was one of my favorite demonstrations to show students the basis for spectroscopy!
answered 7 hours ago
DrMoishe PippikDrMoishe Pippik
15.3k1633
$endgroup$
add a comment |
$begingroup$
The uniform glow is due to ionization and recombination of the residual gas; it's called a glow discharge. At higher pressure, a spark or arc discharge occurs at much higher current density. Fluorescent lamps and neon lamps operate in the glow-discharge region, and high-pressure xenon lamps use an arc discharge.
Elements of the residual gas can be identified by the color of the glow discharge. Nitrogen and argon in air, for example, glow purplish blue.
As pressure decreases further, density is too low (and path too short) to produce a visible glow discharge, but electrons, AKA "cathode rays", hurled off the electrodes impact the walls of the container, which may glow green in borosilicate glass, and in very low pressure vacuum tubes, such as the 1G3GT high-voltage rectifier, the electrons impacting the anode produce X-rays (high energy photons), which may also create fluorescence in the glass shell.
The difference is easy to see in this video, which demonstrates the change in appearance from an arc discharge to glow discharge, and finally to fluorescence of the glass envelope due to X-rays or electron bombardment. The arc starts at ~20 seconds, the glow discharge at ~26 seconds, striations form ~36 seconds, and by ~46 seconds, the glass envelope glows green from electron bombardment (though it might rathet be the green of residual oxygen). This was one of my favorite demonstrations to show students the basis for spectroscopy!
answered 7 hours ago
DrMoishe PippikDrMoishe Pippik
15.3k1633
$endgroup$
The uniform glow is due to ionization and recombination of the residual gas; it's called a glow discharge. At higher pressure, a spark or arc discharge occurs at much higher current density. Fluorescent lamps and neon lamps operate in the glow-discharge region, and high-pressure xenon lamps use an arc discharge.
Elements of the residual gas can be identified by the color of the glow discharge. Nitrogen and argon in air, for example, glow purplish blue.
As pressure decreases further, density is too low (and path too short) to produce a visible glow discharge, but electrons, AKA "cathode rays", hurled off the electrodes impact the walls of the container, which may glow green in borosilicate glass, and in very low pressure vacuum tubes, such as the 1G3GT high-voltage rectifier, the electrons impacting the anode produce X-rays (high energy photons), which may also create fluorescence in the glass shell.
The difference is easy to see in this video, which demonstrates the change in appearance from an arc discharge to glow discharge, and finally to fluorescence of the glass envelope due to X-rays or electron bombardment. The arc starts at ~20 seconds, the glow discharge at ~26 seconds, striations form ~36 seconds, and by ~46 seconds, the glass envelope glows green from electron bombardment (though it might rathet be the green of residual oxygen). This was one of my favorite demonstrations to show students the basis for spectroscopy!
answered 7 hours ago
DrMoishe PippikDrMoishe Pippik
15.3k1633
answered 7 hours ago
DrMoishe PippikDrMoishe Pippik
15.3k1633
answered 7 hours ago
DrMoishe PippikDrMoishe Pippik
15.3k1633
answered 7 hours ago
DrMoishe PippikDrMoishe Pippik
15.3k1633
15.3k1633
add a comment |
add a comment |
M Shehzad is a new contributor. Be nice, and check out our Code of Conduct.
M Shehzad is a new contributor. Be nice, and check out our Code of Conduct.
M Shehzad is a new contributor. Be nice, and check out our Code of Conduct.
M Shehzad is a new contributor. Be nice, and check out our Code of Conduct.
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$begingroup$
To close voters, I'm not sure what is unclear about the question. The OP points to a specific phenomena reference in a book (which should ideally have a citation @MShehzad) and it had a relatively straightforward answer.
$endgroup$
– Tyberius
1 hour ago