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Cathode Rays and Electron Beams

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Questions and Answers

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?

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)?

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?

Because they are emitted by the negative electrode, or cathode, in a vacuum tube Signup and view all the answers

When were cathode rays first named Kathodenstrahlen?

1876 Signup and view all the answers

What are cathode rays and where are they observed?

Cathode rays are streams of electrons observed in discharge tubes. Signup and view all the answers

Who first observed cathode rays and in what year?

German physicist Julius Plücker and Johann Wilhelm Hittorf first observed cathode rays in 1859. Signup and view all the answers

What was the name given to cathode rays in 1876 and by whom?

Eugen Goldstein named cathode rays Kathodenstrahlen in 1876. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

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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Description

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.