Magnitude and direction of the poynting vector
Non-relativistic protons accelerated by a potential difference U form a round beam with current I. Find the magnitude and direction of the Poynting vector outside the beam at a distance r from its axis.
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A solution of sodium iodide containing iodine-131 was given to apatient to test for malfunctioning of the thyroid gland. What fraction of the iodine-131 nuclei would remain undecayed after9.0 d?
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Calculate the hydronium and hydroxide ion concentrations in the solution. Then calculate the mass of magnesim hydroxide needed to make 250ml of the solution.
To reach the equivalence point of a titration, 32.75 ml of 0.350M HCl was added to 25.0 ml of an NH3 solution of unknown concentration. what is the pH of at the equivalence point?what is the pH at the half equivalence point?
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