Which two equations represent double replacement reactions. A. HCl+KOH=KCl+H2O

B. BaCl2+Na2SO4=2NaCl+BaSO4

C.2C2H6+7O2=4CO2 +6H2o

D. Ca+MgS=CaS+Mg

cancer risk hope this

total distance/total time

(85 + 82)/(5+3)

167/8

20 just over

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m