Cathode ray tube, a Rare card

A cathode ray tube is a vacuum tube containing one or more electron guns, which emit electron beams, which are directed and controlled to display images on a phosphorescent screen.
From the Wikipedia article

Rarity: Rare
Domain: Science
ATK: 98
DEF: 100
Power: 198
Wikipedia reads a year: 260,000

Power 198 (ATK + DEF): stronger than 95 % of WikiCards cards.

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Cathode ray tube quiz: 3 questions

Three questions on the Cathode ray tube card, the way WikiCards duels ask them. Pick an answer, the facts are just below.

Find the missing word
A CRT in a TV is commonly called a ______ tube.
Answer
picture. A CRT in a TV is commonly called a picture tube. From the Cathode ray tube article on Wikipedia.
Which of these Wikipedia articles is read the most in a year?
Answer
Periodic table. Periodic table 3,400,000 · Dassault Rafale 1,100,000 · Hannah Arendt 760,000 · Cathode ray tube 260,000 Wikipedia reads over a year.

In a duel, each round asks a question like these about the opposing card, with 15 seconds to answer.

The facts on the card

The card carries these facts from its Wikipedia article.

The images may represent electrical waveforms on an oscilloscope, a frame of video on an analog television set, digital raster graphics on a computer monitor, or other phenomena like radar targets.
A CRT in a TV is commonly called a picture tube.
CRTs have also been used as memory devices, in which case the screen is not intended to be visible to an observer.

Why it is Rare

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The Cathode ray tube article was read about 260,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 98 and blocks with 100: each hit it takes is cut by 40 %.

How to get Cathode ray tube

Open packs. Each pack holds five cards drawn from real Wikipedia articles, the rarest last, and the fifth card is always Rare or better. The odds are shown in the game. A free pack arrives every hour and two can wait, and the Coins you win in duels buy more packs.