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In a cathode ray tube the number of electrons that reach the fluorescent screen is controlled by the A anode B cathode C deflecting plate D grid?
Wiki User
∙ 9y ago
I am about to take this exam myself, so maybe I can help both of us with this.
The choices are:
A.) anode
B.) cathode
C.) deflecting plates
D.) grid
The answer starts on page 86 of your study guide, titled "Cathode Ray Tubes".
In this illustration, current supplied to the heater causes emission of electrons from the cathode. Those electrons pass toward the anodes through an opening in the control grid. The grid limits the number of electrons that can pass through it, and the anodes cause the electrons passing the grid to a point on the fluorescent screen. Also, two deflecting plates are placed in the path of the beam electrons. When a voltage is applied to these plates, the beam is deflected toward the positively charged plates. If the applied voltage is alternating, the beam moves up and down through its normal central position, and the luminous spot moves on the screen in the same way.
Based on this information I have deduced thus...
The answer is not A.) anode. Because the anodes job is to pass the electrons the grid allowed through to the point on the fluorescent screen.
The answer is not B.) cathode. Because the cathode when heated causes emission of electrons, its purpose is not to limit the number of electrons, just to produce the electrons. The answer is not C.) deflecting plates. Because their job is to use the emitted electrons allowed through the grid to make the projection. So, the answer must be D.) Grid. Because the grid limits the number of electrons that can pass through it!
Like I said, I have not taken this exam myself. However, based on the reading material, D just makes sense! I hope this has helped you or anyone else taking this same exam. A lot of questions on this exam are worded wrong and are difficult to understand.
Wiki User
∙ 9y ago
Wiki User
∙ 10y agoDeflecting plate
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What controls the number of electrons that reach the fluorescent screen in a cathode ray tube A anode B cathod Cdeflecting plate D grid?
I am about to take this exam myself, so maybe I can help both of us with this. The choices are: A.) anode B.) cathode C.) deflecting plates D.) grid The answer starts on page 86 of your study guide, titled "Cathode Ray Tubes". In this illustration, current supplied to the heater causes emission of electrons from the cathode. Those electrons pass toward the anodes through an opening in the control grid. The grid limits the number of electrons that can pass through it, and the anodes cause the electrons passing the grid to a point on the fluorescent screen. Also, two deflecting plates are placed in the path of the beam electrons. When a voltage is applied to these plates, the beam is deflected toward the positively charged plates. If the applied voltage is alternating, the beam moves up and down through its normal central position, and the luminous spot moves on the screen in the same way. Based on this information I have deduced thus... The answer is not A.) anode. Because the anodes job is to pass the electrons the grid allowed through to the point on the fluorescent screen. The answer is not B.) cathode. Because the cathode when heated causes emission of electrons, its purpose is not to limit the number of electrons, just to produce the electrons. The answer is not C.) deflecting plates. Because their job is to use the emitted electrons allowed through the grid to make the projection. So, the answer must be D.) Grid. Because the grid limits the number of electrons that can pass through it! Like I said, I have not taken this exam myself. However, based on the reading material, D just makes sense!
Beams of electrons that shine on fluorescent materials are used in?
Cathode ray tubes.
How do cathode ray tubes work?
The cathode ray tube (CRT) is an evacuated glass envelope containing an electron gun (a source of electrons) and a fluorescent screen, usually with internal or external means to accelerate and deflect the electrons. When electrons strike the fluorescent screen, light is emitted. Source: Copied from Wikipedia
Cathode rays were shown to be a stream of?
Cathode rays are electrons.
Is cathode rays are material particles?
The cathode ray is a stream of electrons.
Where did the electrons from cathode ray come from?
In a cathode ray tube (CRT), the particles, which are electrons, originate at the heated cathode, becoming the so-called cathode rays. The electrons stream off the cathode and rush over to the anode.
What are functions of CRT?
Cathode ray tubes have the task of converting electronic signals into a beam of electrons that create pictures on a screen. In most cases, the screens are made of fluorescent tubes.
Why electrons of cathode does not end up after some time because of its continuous emission of electrons?
Because the cathode is connected to an external source of power, from which electrons are continuously supplied to the cathode.
How were electrons produced from the cathode ray ube?
Filament heats a cathode until it gives off electrons.
Difference between direct and indirect cathode ray?
In a directly heated cathode, the filament is the cathode and emits the electrons. In an indirectly heated cathode, the filament or heater heats a separate metal cathode electrode which emits the electrons.
In the cathode ray tube where do the particles originate?
In a cathode ray tube (CRT), the particles, which are electrons, originate at the heated cathode, becoming the so-called cathode rays. The electrons stream off the cathode and rush over to the anode.
What prompted early scientists to propose that the ray of the cathode ray tube was due to the cathode?
The electron had already been discovered. It took little imagination to "see" that the cathode ray was the beam of electrons that originated from the cathode. And the beam was controlled using techniques based directly on what was correctly understood about the electron. The cathode ray could only be an electron beam generated at the cathode. Conventional elctric current flow is usually thought of as flowing from positive to negative, but at the quantum level; due to electrons having a negative charge; technically they really flow from negative to positive, and this is apparent in the cathode ray tube. Its the negatively charged electrons that glow in a cathode ray tube, and do so from the negative terminal, or cathode, hence the name.
