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16
In an atom, when an electron loses energy, why is a photon released? If photons are massless, how are they created in this process and why?
physics.stackexchange.com
8
Limit at infinity of cubic roots and square roots without using conjugate $\lim_{x \to \infty} \frac{\sqrt[3]{x+2}}{\sqrt{x+3}}$
math.stackexchange.com
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