What did Appleton prove the existence of?
Black holes
Ionosphere
Exoplanets
Dark matter
Answer
The existence of the ionosphere, a layer of the Earth's atmosphere that is ionized by solar radiation, was proven by Edward Appleton and Miles Barnett in 1925 using radio waves. Their experiment, known as the Appleton-Barnett experiment, involved transmitting radio waves vertically into the atmosphere and observing the reflected signals.
Unlocking the Ionosphere: The Edward Victor Appleton Challenge
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