Calculate the wavelength (m) of light that has a frequency of 2.17 × 10^11 s-1 a) 1.38*10^-3
b) 6.51*10^19
c) 1.44*10^-22
d) 1.44*10^22
e) 1.38*10^3
f) none of the above

Water is a highly important natural resource. which of these would be the best method to conserve water? a) drinking bottled water b) monitoring the ph of rivers c) treating and re-using wastewater d) testing nitrate levels in groundwater