Tungsten
Rubidium
Neon was used in the modern time for vacuum tubes, television tubes, lasers
It is used as target in x-ray tubes and as a structural member high vacuum electron tubes. It is also use for high temperature applications in reflectory elements.
stontluim
If the questioner means "alkaline earth metal" rather than simply "earth metal", the answer is magnesium. Aluminum is also an "earth metal" in the sense that it occurs naturally as an oxide on earth and would also be an accurate answer to the question as asked.
It used 5200 vacuum tubes.
Millman's theorem
You don't, there aren't any. However some radios in the early 1950s did use both vacuum tubes and transistors. This was because early junction transistors were too slow to operate at RF so vacuum tubes were used in the RF and IF sections. These radios were called hybrid radios because they used both vacuum tubes and transistors.
ENIAC
First generation computers.
FIRST GENERATION
first generation computers
Vacuum tubes were used back in the 19th century and mid-20th century for a number of things. At first they were used just in scientific areas, but then they were used as electronic amplifiers. They were eventually used in the first computers.
red lights, lasers, vacuum tubes, some TV tubes, etc.
they are used for metal-like things,
No, he had to use mechanical gears, etc. because they were the only device technology available in his time. Electric relays were first developed about 15 years after he designed his computer, while vacuum tubes were first developed about 90 years after he designed his computer.
They are devices that are used to control the flow of current.