what type of electromagnetic wave is sent as a signal by a cellphone to the nearst cell tower a- gamma rays b- microwaves c- x-rays d- ultraviloet

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

Astudent weighing 700 n climbs at constant speed to the top of an 8 m vertical rope in 10 s. the average power expended by the student to overcome gravity is most nearly

Carbon tetrachloride (ccl4) is ionic or convalent