How do we know the sizes of atoms?What they are made of?

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Proton -

size ~ 10-15 m

Atom - size ~ 10-10 m

Nucleus - size ~ 10-14 m

Quark ~ 10-18 m

Next lectureDiscovery of electron and nucleus led to basicpictureLed to Quantum Mechanics Uncertainty Principle Many important inventions Lasers Semiconductors (Your computer!) . . . . Later

Understanding of the Universe!

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