A system proposed by the U S Navy for underwater submarine communication called ELF Extremely Low Frequency operates with a frequency of 76 Hz 1000 m 1 km 1km 0 62137 mi C AV E hv c 3 00 x 108 m s h 6 626 x 10 34 J s 1 Hz 1 s1 HINT Be sure to report final answers to correct significant figures units and in scientific notation c What is the energy of radiation in joules 5 0 x 10 32 5 03 x 10 32 8 72 x 10 36 8 7 x 10 36