How can different EM signals (like radio broadcasts and cell phone conversations) take place without intererring with each other? 1) radios and cellphones r tuned to only detect em waves of the proper frequency
2) em waves of different wavelengths never interfere with on another
3) radio broadcasts r sent at ground level while cellphone signals r sent to space
4) the interference only happens for a fraction of a second. most of the time theyre not interferring

Bradley was working in the lab. he accidentally poured a container of concentrated hydrochloric acid into his container of distilled water. not thinking much of it, he continued with his work as if nothing happened. which of these would be the result of this laboratory accident? a) the water will change to a bright pink color. b) the new solution would decrease in temperature. c) the solution has now become a good conductor of electricity. d) hcl and water have the same chemical and physical properties, so nothing would happen.