The New Encyclopaedia Britannica, Volume 8 |
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Page 219
... frequencies spaced 10 kHz apart between 535 and 1,605 kHz . Radio waves in this frequency range are effectively reflected back to the Earth's surface by the ionosphere and can be detected by receivers hundreds of miles away . In ...
... frequencies spaced 10 kHz apart between 535 and 1,605 kHz . Radio waves in this frequency range are effectively reflected back to the Earth's surface by the ionosphere and can be detected by receivers hundreds of miles away . In ...
Page 818
... frequency standard ( not use- ful for ordinary timekeeping ) based on the extremely sharp frequency of the gamma emis- sion ( electromagnetic radiation arising from radioactive decay ) and absorption in certain atomic nuclei , such as ...
... frequency standard ( not use- ful for ordinary timekeeping ) based on the extremely sharp frequency of the gamma emis- sion ( electromagnetic radiation arising from radioactive decay ) and absorption in certain atomic nuclei , such as ...
Page 951
... frequencies , thus changing the lower frequency and altering the pitch . Later , a wire was stretched across a model key- board ; the player touched the wire to vary the frequency . In another version the frequency changes are ...
... frequencies , thus changing the lower frequency and altering the pitch . Later , a wire was stretched across a model key- board ; the player touched the wire to vary the frequency . In another version the frequency changes are ...
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