48 questions · 24 sources · 0 syntheses
Radio and Broadcasting History
The invention and spread of radio and television broadcasting.
Source-derived questions
Questions extracted from the papers in this topic, excluding the curated questions above.
- How did Appleton use interference between a direct and a reflected radio wave to measure the height of the ionosphere?
- How did Henri Becquerel discover radioactivity while trying to test something else entirely?
- How did Lippmann's photographic plates record colour without using any dyes or filters?
- How did Marconi's transatlantic wireless signal of 1901 depend on innovations he didn't personally develop?
- How did Wozniak's colour graphics circuit exploit an artifact in the NTSC television standard to avoid dedicated hardware costs?
- How did a precise theory of electrons boiling off a hot filament make vacuum tubes possible for early radio and television?
- How did photographic emulsions work as a particle detector?
- How did the 1920 transatlantic radio test lay groundwork for commercial broadcasting?
- How did the ionosphere's behavior at night versus day complicate early long-distance radio transmission?
- How does amplitude modulation differ from simply switching a carrier wave on and off?
- How does lighting condition change the number of exposures needed to avoid a blinking subject?
- How long did the triode remain the dominant amplification technology before being replaced?
Show 36 more questions
- How was radio different for ordinary households in 1920 compared to its first two decades of Morse-code operators and amateur enthusiasts?
- What atmospheric layer turned out to explain how Marconi's signal reached Newfoundland, and why wasn't it understood at the time?
- What could Fleming's two-electrode vacuum tube do, and what could it not do?
- What did Ferdinand Braun's coupled-circuit transmitter contribute to radio that Marconi's own equipment lacked?
- What did Jenkins's 1925 radiovision demonstration actually transmit, and over what distance?
- What did Lee de Forest add to the vacuum tube to create the Audion, and how did it work?
- What did Reginald Fessenden actually broadcast on Christmas Eve 1906?
- What did ships' radio operators normally expect to hear over wireless before Fessenden's Christmas Eve broadcast?
- What did the AutoVision device actually do inside a moving car?
- What did the spotted patterns on Friedrich and Knipping's photographic plates reveal about crystal structure?
- What happened after Baird's 1924 transmission that led to a public demonstration and a BBC contract?
- What household materials did John Logie Baird use to build his first television apparatus?
- What information does ordinary photography discard that holography manages to preserve?
- What kind of programming did KDKA in Pittsburgh broadcast when it launched in November 1920?
- What later innovation in blue LEDs made white LED lighting possible?
- What other scientific fields ended up using emulsion-based particle tracking?
- What signal did Marconi hear on Signal Hill, and how far had it traveled?
- What was the first image Baird successfully transmitted, and how clear was it?
- What were Penzias and Wilson actually trying to do with their horn antenna when they found the mysterious hiss?
- What were the resolution and frame rate of Baird's October 1925 television demonstration?
- What would global radio communication have required without a reflecting layer in the upper atmosphere?
- Where was Fessenden's transmitting station located?
- Who became the first person to appear live on television, and how much was he paid?
- Who or what was Stooky Bill, and why was it Baird's first subject for greyscale television?
- Why did Jenkins's rotating disk system produce silhouettes rather than clear images?
- Why did Korolev's team design Sputnik 1 to broadcast a simple radio beep rather than carry scientific instruments?
- Why did Lippmann's interference-based colour process lose out to dye-based photography despite producing more accurate colour?
- Why did broadcasters and receiver manufacturers need each other for radio to become a mass medium?
- Why did lighthouses before 1912 require a human keeper to operate them every dusk and dawn?
- Why did scientists initially doubt that a radio signal could travel across the curve of the Earth?
- Why did the Ig Nobel committee treat AutoVision's working engineering as the problem rather than the achievement?
- Why didn't Jenkins receive lasting credit for inventing television despite this early demonstration?
- Why does combining red, green, and blue LEDs into white light matter for global energy use?
- Why does the F-layer of the atmosphere allow long-distance shortwave radio to skip around the curve of the Earth?
- Why was splitting the prize between Marconi and Braun considered diplomatically awkward?
- Why was the ability to amplify a signal such a significant advance over merely detecting one?
Sources
- Apple II personal computer introduced
- Charles Francis Jenkins demonstrates synchronized television and sound
- Commercial radio receivers go on sale in the United States
- Cosmic microwave background detected at Bell Labs
- Dennis Gabor invents holography
- First transatlantic two-way radio broadcast
- First visible-spectrum LED demonstrated
- Ig Nobel Prize in Mathematics
- Ig Nobel Prize in Visionary Technology
- John Logie Baird transmits greyscale television images
- John Logie Baird transmits television images
- Lee de Forest invents the triode (Audion) vacuum tube
Show 12 more sources
- Marconi achieves first transatlantic radio transmission
- Nobel Prize in Physics
- Nobel Prize in Physics
- Nobel Prize in Physics
- Nobel Prize in Physics
- Nobel Prize in Physics
- Nobel Prize in Physics
- Nobel Prize in Physics
- Nobel Prize in Physics
- Reginald Fessenden transmits first human voice over wireless
- Sputnik 1: first artificial Earth satellite
- von Laue discovers X-ray diffraction by crystals