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Because it absorbs visible light.
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Why cathode rays are negatively charged?
Cathode rays are produced when the metal cathode has a high voltage applied to it - this has the effect of "boiling" the electrons off the cathode's surface producing cathode rays, and so cathode rays can be seen as a stream of electrons i.e. negatively charged particles.AnswerElectrons are released from the surface of a cathode through thermionic emission. This is achieved by a heaterlocated at the cathode, and not due to a high voltage. The function of the high voltage (between the cathode and an anode placed closer to the screen) is to attract these electrons towards the screen of the CRT. So a 'cathode ray' is simply a beam of electrons which, of course, are negatively charged.
How magnetic field is related with cathode rays in physics?
When a magnetic field is applied to a cathode ray, the cathode ray is deflected.
What is a material that takes up space called?
Dark matter
Why is the beam of light called a cathode ray?
Cathode rays are beams of electrons.
Is it true that Electrons were discovered when an electric current was passed through gases at low pressures?
Yes, Sir J.J.Thompson did exactly that. ( although at that time the terms used for these phenomena were different). In 1897, Thompson heated a metal to produce cathode rays or electrons. These electrons were attracted towards an anode by providing a potential difference between the two electrodes. Between the cathode and electrode was air at very low pressure which did not stop these cathode rays. Sir Thompson studied these beams in the space between the anode and cathode.
What is an Aston dark space?
An Aston dark space is a dark space in a glow discharge which is adjacent to the cathode.
Is the amount of space charge created at the cathode is primarily controlled by the tube current?
The cathode space charge is determined by the voltage on the filament.
What is the negatively charged electrode of a cathode ray tube?
The negatively charged electrode of a cathode ray tube (CRT) is the cathode. The tube is a cathode ray tube, and electrons stream off the cathode, are accelerated across the evacuated space and "directed" either electromagnetically or electrostatically, and then strike the phosphor coating on the positively charged anode at a "location" determined by the "directing" elements.
What is a negative space?
Negative space is dark energy and dark matter.
When was Dark Space I created?
Dark Space I was created on 2003-10-13.
When was Dark Space III created?
Dark Space III was created on 2008-05-30.
In space is it dark?
Yes! space is pitch black! however, because of the light of the stars,and especially the sun..... space is really glowing with light . but it is still dark in space .
Can stars be dark?
the space has no boundaries so trillions of stars are in the space it gets not enough light that is why the space is dark
What are the ratings and certificates for Dark Space - 2013?
Dark Space - 2013 is rated/received certificates of: Germany:12
Do the Toy Story collection space aliens glow in the dark?
Yeah, the Space Aliens grow in the dark, but you charge them in the light :)
Where is located Dark Matter?
All over the dark expanse of space.
What is space that has no matter?
Space that has no matter is called a vacuum. It is characterized by the absence of particles, such as gas molecules and atoms, and is devoid of any substance. Vacuums exist in outer space and are created artificially in vacuum chambers on Earth.
