What device was Roentgen using when he discovered x-rays?

What device was Roentgen using when he discovered x-rays?

• A. Anode tube
• B. Crookes tube
• C. Coolidge tube
• D. Geissler tube

Answer: (B)

Röntgen was using a Crookes tube, a glass discharge tube with a partial vacuum and electrodes (cathode and anode). When high voltage was applied, cathode rays were produced and traveled to the tube walls, causing a fluorescent screen nearby to glow and, crucially, exposing photographic plates even when blocked from visible light. This led to the discovery of X-rays. Earlier or later tubes like Geissler tubes or Coolidge tubes operate on different principles or at different times, but the specific device behind the discovery was the Crookes tube.

Röntgen was using a Crookes tube, a glass discharge tube with a partial vacuum and electrodes (cathode and anode). When high voltage was applied, cathode rays were produced and traveled to the tube walls, causing a fluorescent screen nearby to glow and, crucially, exposing photographic plates even when blocked from visible light. This led to the discovery of X-rays. Earlier or later tubes like Geissler tubes or Coolidge tubes operate on different principles or at different times, but the specific device behind the discovery was the Crookes tube.