What are the most commonly used materials as photo cathode for the photoelectric emission?
A. Barium and calcium
B. Cesium and rubidium
C. Arsenic and boron
D. Thorium and tungsten
Answer: C
What are the most commonly used materials as photo cathode for the photoelectric emission?
A. Barium and calcium
B. Cesium and rubidium
C. Arsenic and boron
D. Thorium and tungsten
Answer: C
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