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7 Who is the scientist who first used a powerful vacuum pump to nearly evacuate glass tubes filled with metal electrodes?​

Sagot :

Answer:

physicist William Crookes

Crookes Tubes

In the 1870s, British physicist William Crookes and others were able to evacuate rarefied tubes to a pressure below 10−6 atm. These were called Crookes tubes. Faraday had been the first to notice a dark space just in front of the cathode, where there was no luminsense.

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Answer:

william crookes jj thomson

Explanation:

yun lang ;)