Channel 6 on your television consists of radio waves with wavelengths between 3.41 m and 3.66 m. consider a 25,000-watt television station located 70 km from your home. use the be- low equation for the energy density of blackbody radiation to estimate the ratio of the number of channel 6 photons to the number of cmb photons that your television antenna picks up in this wavelength band. (hint: for the television broadcast, recall that the energy density of an electromagnetic wave is related to the time-averaged poynting vector by u-(s)/c.)

Electroplating is a way to coat a complex metal object with a very thin (and hence inexpensive) layer of a precious metal, such as silver or gold. in essence the metal object is made the cathode of an electrolytic cell in which the precious metal cations are dissolved in aqueous solution. suppose a current of 480.ma is passed through an electroplating cell with an aqueous solution of agno3 in the cathode compartment for 46.0 seconds. calculate the mass of pure silver deposited on a metal object made into the cathode of the cell. round your answer to 3 significant digits. also, be sure your answer contains a unit symbol. ×10μ