Continuing the thinking in the last three exercises, convert this energy to an equivalent in mass, use einstein’s equation e = mc2. hint: divide the energy per m3 calculated in exercise 29.27 by the speed of light squared. check your units; you should have an answer in kg/m3. now compare this answer with the critical density. your answer should be several powers of 10 smaller than the critical density. in other words, you have found for yourself that the contribution of the cmb photons to the overall density of the universe is much, much smaller than the contribution made by stars and galaxies.
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Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.
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Dopasuj wartości pracy z ramki do przedstawionych sytuacji ,a nastepnie wyraż te prace w dżulach uwaga jedna wartośc pracy nie bedzie pasowała do żadnej sytuacji
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Continuing the thinking in the last three exercises, convert this energy to an equivalent in mass, u...
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