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At the radio tower of an AM radio station, the lemon becomes a test: the radiofrequency heats, vibrates, and releases sound as soon as the transmitter is activated.
Before AM radio completely disappears with the migration, an operator decides to conduct a test that he has always mentioned to those who work near the antenna: the energy from the radio tower can generate heat and even make an object “sing”. To prove this, he chooses what seems most unlikely and precisely for that reason draws attention: a lemon.
With the transmitter off, he places the lemon in the spark gap, right between the positive and negative of the radio tower’s antenna. Then he asks them to turn on the transmitter. Within seconds, the lemon begins to heat up, sound comes out, and the fruit gets so hot that it eventually falls.
The moment when the lemon “sings” at the radio tower
The test is quite straightforward. He shows the tower, positions the lemon between the points of the antenna, and only then asks them to turn on the transmitter. The fun of the demonstration is that you can see the effect starting right away.
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As soon as the transmitter is activated, the lemon “sings.” The sound appears as the fruit heats up, as if it were becoming a small emitter of vibration. It’s not a beautiful or tuned sound, but it’s enough for you to realize that something is happening there.
Why radiofrequency heats and turns into sound
The explanation he gives is simple: amplitude modulated radiofrequency generates heat and makes the molecules vibrate. And when this vibration gains strength, it can turn into sound, as if the fruit were functioning as a body that trembles and “speaks.”
He emphasizes that the sound comes from the vibration of the molecules and the heat generated by the radiofrequency. That’s why the lemon heats up so quickly and why, at certain moments, you can hear the noise “coming out” of it.
Low or high: the water in the lemon changes what you hear
During the demonstration, he comments that he had recorded a higher sound before, but at that moment a lower sound came out. His reading is that the lemon has a lot of water and this influences the result.
In other words, besides heating, the lemon responds like a “vibrating body,” and the amount of water can change the way the sound appears.
What this test shows about the AM radio tower
In the end, what he wants to make clear is something very straightforward: the AM radio tower radiates radio frequency with enough strength to generate heat and cause perceptible vibration. And the lemon becomes a quick way to see this without needing technical instruments.
It’s not a sophisticated trick, it’s a simple demonstration of the “look at this happening now” type.
So, being very honest: if you were there next to it and saw the lemon heat up and “sing” in seconds, would you find it curious or would you step back immediately?
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