The microwave radiation left over from the Big Bang explosion of the universe has an average energy density of 3.84 x 10'14 J/ms. What is the rms value of the electric eld of this radiation? Number n Units v In a dentist's ofce an Xray of a tooth is taken using Xrays that have a frequency of 5.31 x 1018 Hz. What is the wavelength in vacuum of these Xravs? Number n Units v A distant galaxy is simultaneously rotating and receding from the earth. As the drawing shows, the galactic center is receding from the earth at a relative speed of uc = 1.8000 x 105 m/s. Relative to the center, the tangential speed is VT = 0.5800 x 10 m/s for locations A and B, which are equidistant from the center. When the frequencies of the light coming from regions A and B are measured on earth, they are not the same and each is different from the emitted frequency of 7.338 x 1014 Hz. Find the measured frequency for the light from (a) region A and (b) region B. (Give your answer to 4 significant digits. Use 2.998 x 10 m/s as the speed of light.) AUG B Galaxy Earth (a) Number Units (b) Number i Units v