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Why doesn’t a nuclear bomb create a chain reaction that destroys the entire planet?

  Because real life is not Hollywood plus 4 reasons. Fission vs. Fusion : Nuclear bombs work on the principle of nuclear fission – splitting heavy atoms like uranium or plutonium. This releases energy, sure, but to destroy the entire planet? Not enough oomph. What you'd need is a fusion reaction, the kind that fuels stars. That involves lighter atoms like hydrogen fusing, and it's way more powerful. Think of fission as a firecracker, fusion as the sun. We're nowhere near making a fusion bomb as big as our planet. The Limits of Chain Reactions : Even in a fission bomb, the chain reaction doesn't run wild forever. The explosion itself scatters the nuclear fuel, disrupting the critical mass needed to sustain the reaction. It's like trying to keep a bonfire going by throwing the logs across the field. Dissipation of Energy : The colossal energy released by a nuke mostly disperses as heat, light, and a shockwave. Earth is just way too big to absorb all that and go kabloo...
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What is the exact speed of light in vacuum and in other Medium?

 The exact speed of light in a vacuum, as per the current scientific understanding, is approximately 299,792,458 meters per second (or about 186,282 miles per second).

When light travels through different materials or mediums, its speed changes. It slows down when passing through a medium other than a vacuum. The speed of light in a medium is described by the refractive index of that material. For example, in water, light travels at about 75% of its speed in a vacuum, and in glass, it can be around 66% of the speed in a vacuum, depending on the type of glass.

The speed of light in a medium is generally given by the equation;

v = c/v

Where;

v = speed of light in medium

c = speed of light in vacuum

n = refractive index of medium

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