What is the frequency of radiation whose wavelength is 26.80 Angstrum ?
at first i got 1.000e17 and it was wrong. now i only have 1 more try. i tried it again and got
9.993e16 but i don't want to put it in unless its correct. can you guys check my work?
Your first answer was closer. I suspect you have your calculator set and you rounded too much.
26.8 A (note the correct spelling of Angstrom) = 26.8E-8 cm = 2.68E-9 m
c = frequency x wavelength
frequency = 3.00E8/2.68E-9 = 1.119E17 which rounds to 1.12E17 Hz to three significant figures. (Another reason yuor answer may have been counted wrong is the you typed in 4 s.f. and not 3).