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| signal plate | |||
| photoemissive cathode | |||
| photo-cathode; photoelectric cathode | |||
| photocathode | |||
| photosensitive cathode | |||
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photocathode : 30 phrases in 6 subjects |
| American usage, not spelling | 2 |
| Earth sciences | 1 |
| Electronics | 2 |
| Information technology | 1 |
| Nuclear physics | 10 |
| Radiation | 14 |