5 ms·
Radioactive materials are used in wristwatches. https://en.wikipedia.org/wiki/Tritium_radioluminescence https://en.wikipedia.org/wiki/Tritium_radioluminescence
by windows_tips 8y ago
Radioactive materials are used in wristwatches.
https://en.wikipedia.org/wiki/Tritium_radioluminescence https://en.wikipedia.org/wiki/Tritium_radioluminescence