Conduction of Electricity Through Gases
Conduction of Electricity Through Gases
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91 ; cviii. P. 1241 ; Physikalische Revue, Bd. I. , 1892.
IF Elster and Geitel, Wied. Ann. Xxxviii. Pp. 40, 497, 1889 ; xli. P. 161, 1890 ; xlii. P. 564, 1891 ; xliii. P. 225, 1892 ; lii. P. 433, 1894 ; Iv. P. 684, 1895.
129] IONISATION BY LIGHT. PHOTO-ELECTRIC EFFECTS. 251 The ultra-violet light to produce these effects may be obtained from an arc lamp, or by burning magnesium, or by sparking with an induction coil between zinc or cadmium terminals, the light from which is very rich in ultra-v...iolet rays. Sunlight is not rich in ultra-violet rays, as these have been absorbed by the atmosphere, and it does not produce nearly so large an effect as the arc-light. Elster and Geitel, who have investigated with great success the effects produced by light on electrified bodies, have shown that the more electropositive metals lose negative charges even when exposed to ordinary daylight. They found that amalgams of sodium or potassium enclosed in a glass vessel lose a negative charge in the daylight, though the glass would stop any small quantity of ultra-violet light that might be left in the light after its passage through the atmosphere.
What to read after Conduction of Electricity Through Gases?
You can find similar books in the "Read Also" column, or choose other free books by J J Joseph John Thomson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
91 ; cviii. P. 1241 ; Physikalische Revue, Bd. I. , 1892.
IF Elster and Geitel, Wied. Ann. Xxxviii. Pp. 40, 497, 1889 ; xli. P. 161, 1890 ; xlii. P. 564, 1891 ; xliii. P. 225, 1892 ; lii. P. 433, 1894 ; Iv. P. 684, 1895.
129] IONISATION BY LIGHT. PHOTO-ELECTRIC EFFECTS. 251 The ultra-violet light to produce these effects may be obtained from an arc lamp, or by burning magnesium, or by sparking with an induction coil between zinc or cadmium terminals, the light from which is very rich in ultra-v...iolet rays. Sunlight is not rich in ultra-violet rays, as these have been absorbed by the atmosphere, and it does not produce nearly so large an effect as the arc-light. Elster and Geitel, who have investigated with great success the effects produced by light on electrified bodies, have shown that the more electropositive metals lose negative charges even when exposed to ordinary daylight. They found that amalgams of sodium or potassium enclosed in a glass vessel lose a negative charge in the daylight, though the glass would stop any small quantity of ultra-violet light that might be left in the light after its passage through the atmosphere.
What to read after Conduction of Electricity Through Gases?
You can find similar books in the "Read Also" column, or choose other free books by J J Joseph John Thomson to read onlineMoreLess
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