Table of Contents
What is a Lenard?
: a mixture of cathode rays that have emerged from a vacuum tube into the outside space through a window consisting of a piece of thin metal foil and rays emitted by the foil as a result of the incidence of the cathode rays.
What is discharge tube experiment?
In discharge tube experiment, at low pressure and at very high voltage, an electric current is passed. Due to passage of electric current, a stream of rays is passed in the tube originating from cathode. These rays are called “CATHODE RAYS”. These rays originate from cathode.
Why are glass tubes used for electron experiments evacuated?
When they struck atoms in the glass wall, they excited their orbital electrons to higher energy levels, causing them to fluoresce. Crookes tubeA Crookes tube is a rarefied tube evacuated to a pressure below 10−6 atm. It was used in discovery of cathode rays.
Who conducted the Maltese Cross experiment?
Crookes was very innovative in his investigations with vacuum tubes and designed a variety of different types to be used in his experimental work. One of the most famous is the Maltese cross Crookes tube, which he used to demonstrate that cathode rays travel in straight lines.
How do you spell Lenard?
Variations. The name has variants in other languages: Leen, Leendert, Lenard (Dutch) Lehnertz, Lehnert (Luxembourgish)
What is the purpose of discharge tube?
discharge tube in Electrical Engineering A discharge tube is an electrical device in which current flow is by electrons and ions in an ionized gas, as in a fluorescent light or a neon tube.
Why it is called discharge tube?
If an electric current flows through a gas, it is known as electrical conduction or discharge in the gas. A tube used to study the electrical conduction through gases at low pressure known as discharge tube.
Which scientist did the gold foil experiment?
Ernest Rutherford
Read more about Ernest Rutherford, the physicist whose gold-foil experiment revealed key information about the structure of atoms.
How did Crookes discover the electron?
Crookes’ discovered the electron. He did so by reconstructing the Cathode Ray. Crookes’ put black vanes on one side and silver on the other, which cause the vacuum tube to spin when it hit light. Since the Cathode Ray had previously been built, he needed to call it something else.
How does the Maltese Cross tube work?
How it works: Electrons accelerated from the cathode at the rear of the tube are carried by their momentum to the front wall, where they strike the glass and cause it to fluoresce. However, those electrons on a collision course with the cross never reach the glass, leaving a dark shadow in the green fluorescence.
What did Maltese cross prove?
Maltese cross When the tube was turned on, the cathode rays cast a sharp cross-shaped shadow on the fluorescence on the back face of the tube, showing that the rays moved in straight lines.
What does Laniard mean?
laniard – a cord worn around the neck to hold a knife or whistle.