How much time does it take light to pass a hydrogen atom??? Keep in mind that the ground state orbital for hydrogen is 0.53 Angstroms, and the speed of light is the fastest there is, 300,000,000 m/s. Do the math, and obviously it does not take much time for this to happen. It has been measured, and is 247 zeptoseconds! This might be the only time in your life you even see the prefix 'zepto,' which is 10^-21!! Wow!!
Check out the article that explains how scientists did this.
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