A photovoltaic panel with an efficiency of 19% receives an average insolation equal to theaverage worldwide average insolation on a horizontal surface. This panel is used with anappropriate storage system (100% efficient) to meet the average household electricity requirements

Required:
a. What is the required area of the panel?
b. What is the annual savings in CO2 emissions compared to the same amount of electricity supplied by 40% efficient coal-fired generating stations?

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.