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Base in your questions that ask what cause the bright lines seen in the emission spectrum and i think the best answer to that is the H2 gas is used when protons was heated so the electron absorb all the photons and get exited and resulted by given of a light.
Answer: all of the above and yes
hope thsi helps
Physiotherapists help people affected by injury, illness or disability through movement and exercise, manual therapy, education and advice
They, will probably strike out at any convenient target.
Option C is your answer.
