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Cathode-Rays are streams of electrons. Having a charge of -1 and a small mass (about 1 /1836th of a proton), they interact easily. Since you don't want them to interact with the atoms in the tube (air, etc.), you evacuate the tube, leaving it in as near a vacuum state, or zero PSIA, as possible.
What else can I help you with?
When trying to lead class evacuated tube so I collected in the same order of draws plastic tubes true or false?
I say true
How does a photomultiplier tube works?
A photomultiplier tube works by converting incoming light photons into an electrical signal. When light hits the photocathode of the tube, it emits electrons through photoelectric effect. These electrons are then multiplied by a series of dynodes within the tube, resulting in a larger current that is proportional to the intensity of the incoming light. This amplified signal can then be measured and analyzed.
Who discovered gas discharge tube?
Johann Wilhelm Hittorf, a German physicist, is credited with discovering the gas discharge tube in the mid-19th century. His experiments with cathode rays in partially evacuated tubes laid the foundation for the development of early gas discharge tubes.
Why tungsten in cathode ray tube coated with thorium oxide or barium oxide?
Tungsten is used in the cathode ray tube (CRT) because it has a high melting point and good thermionic emission properties, which means it can easily release electrons. The thorium oxide or barium oxide coating on the tungsten helps to improve electron emission efficiency by reducing work function and enhancing electron current. This combination allows for better electron beam production in the CRT.
What is the name of the procedure examine the large intestine?
The procedure to examine the large intestine is called a colonoscopy. This involves using a colonoscope, a long, flexible tube with a camera on the end, to visually inspect the inside of the colon for any abnormalities or signs of disease.
What evacuated tube would you use to draw for electrolytes?
red topped tube
What does a evacuated tube system requires?
What does the evacuation system
Establishing a charge between two elements in an evacuated tube in known as what?
I think there may be some confusion here - I believe it's more likely that you would establish a VOLTAGE between the two elements. Of course the voltage usually implies charges, but the charges will be on each of the elements, not between them.
Who discovered electrons through an evacuated glass tube?
JJ Thompson
What decreases the vacuum draw of evacuated tube?
Both time and temperature can decrease the vacuum draw of an evacuated tube. Hence the provided expiration dates and storage temperature of tubes. The vacuum of a tube will decrease if it is too old or if stored at a colder temperature than recommended.
What is the common needle gauges used for drawing blood with a evacuated tube?
21g
What color tube is for blood cultures?
The yellow evacuated tubes are for blood cultures.
Is it require to mix and evacuated tube type light blue in time of collection?
No
When collecting blood in a black top evacuated tube how full should it be?
It needs to be 100% full as the light blue tube.
What is the the spectrum emitted by discharge tube?
The spectrum emitted by a discharge tube typically consists of discrete lines corresponding to the characteristic emission wavelengths of the elements or gases inside the tube. This emission spectrum results from the de-excitation of electrons in the atoms or molecules within the tube when they return to lower energy levels, emitting photons of specific energies. This emission pattern is unique to each element or gas, enabling scientists to identify the substances present in the discharge tube.
Which color topped evacuated tube is used for collection of blood for electrolyte testing?
The color-topped evacuated tube typically used for the collection of blood for electrolyte testing is a green-top tube, which contains heparin as an anticoagulant. Heparin prevents clotting and ensures accurate testing of electrolyte levels in the blood.
Why thermionic valve or vacuum tube are evacuated?
because if it was heated in open air it would burn up
