The Federal Communication Commission (FCC) is charged with the regulation of all things which emit or receive radio signals.State A enacts a law which states that all remote garage door openers must "generate a signal no more 1.5mhz in strength."The FCC requires such signals to be a minimum of 2.5 mhz in size.The state law was enacted to combat the growing health problems associated with the use of such systems.Which law is valid?