Atoms internal energy drops
The isolated atom can emit a photon, and the atom’s internal energy drops. Is it possible that an isolated electron emit a photon? Describe why or why not.
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A bullet of 7.0 g is fired to a ballistic pendulum of1.5 kg. The bullet emerges from the block having a speed of 200 m/s, and the block increases to a maximum height of 10 cm. Determine the initial speed of the bullet.
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