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Questions and Answers
Who first observed cathode rays?
Who first observed cathode rays?
- Thomas Edison
- Julius Plücker and Johann Wilhelm Hittorf (correct)
- J. J. Thomson
- Eugen Goldstein
What did J. J. Thomson discover about cathode rays?
What did J. J. Thomson discover about cathode rays?
- They were composed of a previously unknown negatively charged particle (correct)
- They were composed of protons
- They were composed of photons
- They were composed of positively charged particles
How are cathode rays used in cathode-ray tubes (CRTs)?
How are cathode rays used in cathode-ray tubes (CRTs)?
- To emit light for illumination
- To render an image on a screen (correct)
- To produce sound waves
- To generate X-rays
Why are cathode rays so named?
Why are cathode rays so named?
When were cathode rays first named Kathodenstrahlen?
When were cathode rays first named Kathodenstrahlen?
What are cathode rays and where are they observed?
What are cathode rays and where are they observed?
Who first observed cathode rays and in what year?
Who first observed cathode rays and in what year?
What was the name given to cathode rays in 1876 and by whom?
What was the name given to cathode rays in 1876 and by whom?
What did British physicist J. J. Thomson demonstrate about cathode rays in 1897?
What did British physicist J. J. Thomson demonstrate about cathode rays in 1897?
How are cathode-ray tubes (CRTs) used to render an image on a screen?
How are cathode-ray tubes (CRTs) used to render an image on a screen?
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Study Notes
Cathode Rays
- Cathode rays, also known as electron beams (e-beam), are streams of electrons observed in discharge tubes.
Observation and Discovery
- Observed in 1859 by Julius Plücker and Johann Wilhelm Hittorf.
- Named "Kathodenstrahlen" or cathode rays in 1876 by Eugen Goldstein.
Composition and Properties
- Composed of negatively charged particles, later named electrons.
- Electrons were first identified in 1897 by British physicist J.J. Thomson.
Applications
- Used in Cathode-ray tubes (CRTs) to render images on a screen.
- Focused beam of electrons is deflected by electric or magnetic fields to produce the image.
Mechanism
- Electrons are released from the negative electrode (cathode) in a vacuum tube.
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