In class we learned that particles and radiation field can exchange energy, but the total energy needs to be conserved. find out whether a non-relativistic free electron can absorb a photon from a light field. to that end set up total (electron and radiation field) energy and momentum conservation relations by assuming that the electron velocity changes from v to u after a photon with energy ω and momentum h. k =h a/c has been absorbed. can both energy and momentum conservation of the electron-photon system be fulfilled at the same time?

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Answer;

hot magma rises and pushes up toward the lithosphere, and as it cools it cycles back down toward the core to be heated again.

explanation; convection currents are the circular pathways taken by a fluid that enhances heat transfer by the process known as convection which occurs in fluids.convection currents transfer heat from one place to another by mass motion of a fluid. earth mantle is in a semi-liquid state and behaves like any other fluid, rising up from the bottom of the mantle after becoming hotter and less dense from heat of the earth's core, as the rock loses heat into the earth's crust it becomes cooler and more dense, then sinking back down to the core, then repeating the cycle.