10 Questions
Who first observed cathode rays?
Julius Plücker and Johann Wilhelm Hittorf
What did J. J. Thomson discover about cathode rays?
They were composed of a previously unknown negatively charged particle
How are cathode rays used in cathode-ray tubes (CRTs)?
To render an image on a screen
Why are cathode rays so named?
Because they are emitted by the negative electrode, or cathode, in a vacuum tube
When were cathode rays first named Kathodenstrahlen?
1876
What are cathode rays and where are they observed?
Cathode rays are streams of electrons observed in discharge tubes.
Who first observed cathode rays and in what year?
German physicist Julius Plücker and Johann Wilhelm Hittorf first observed cathode rays in 1859.
What was the name given to cathode rays in 1876 and by whom?
Eugen Goldstein named cathode rays Kathodenstrahlen in 1876.
What did British physicist J. J. Thomson demonstrate about cathode rays in 1897?
J. J. Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, which was later named the electron.
How are cathode-ray tubes (CRTs) used to render an image on a screen?
CRTs use a focused beam of electrons deflected by electric or magnetic fields to render an image on a screen.
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.
Test your knowledge of cathode rays and electron beams in this quiz. Explore the history of their discovery, their properties, and their applications in various fields.
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