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How did the Planck's constant come to be?

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How did the Planck's constant come to be?

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As we all know, Planck's constant is defined by 6.626 × 10⁻³⁴ m² kg/s or J/s. But Ho w did

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what is the significant application of studying atomic physics?

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what is the significant application of studying atomic physics?

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https://www.iop.org/publications/iop/2010/file_42531.pdf

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The four fundamental forces are:
- weak interaction
- strong interaction
- electromagnetism
- gravity

Here I have also provided a link for a YouTube Video briefly explaining the Four Fundamental Forces.

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The Four Fundamental Forces Of Physics Explained

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Is there something smaller than an atom? What are subatomic particles?

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Is there something smaller than an atom? What are subatomic particles?

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Subatomic particles are; any of numerous subatomic constituents of the physical world that interact with each other, including electrons, neutrinos, photons, and alpha particles.

Here I have also provided a link for a YouTube Video briefly explaining what subatomic particles are.

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Subatomic Particles Explained In Under 4 Minutes

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Topic 7.1.1 - Discrete energy and radioactivity