in his explanation of the threshold frequency in thephotoelectric effect, Einste

Question

in his explanation of the threshold frequency in thephotoelectric effect, Einstein reasoned that the absorbed photonmust have the minimum energy required to dislodge an electron fromthe metal surface. this energy is called the work function ()of the metal. what is the longest wavelength of radiation (in nm)that could cause the photoelectric effect in each of the followingmetals? tantalum = 6.41*10^-19 J barium = 4.3*10^-19 J tungsten = 7.16*10^-19 J can someone please do this because i have no idea what to doin it? thank you. in his explanation of the threshold frequency in thephotoelectric effect, Einstein reasoned that the absorbed photonmust have the minimum energy required to dislodge an electron fromthe metal surface. this energy is called the work function ()of the metal. what is the longest wavelength of radiation (in nm)that could cause the photoelectric effect in each of the followingmetals? tantalum = 6.41*10^-19 J barium = 4.3*10^-19 J tungsten = 7.16*10^-19 J can someone please do this because i have no idea what to doin it? thank you.

Explanation / Answer

E = h*c/ = h*c/E tantalum = (6.626e-34 J*s)*(3e8m/s)/(6.41e-19 J) =3.10109204e-7 m = 310 nm barium = (6.626e-34 J*s)*(3e8m/s)/(6.41e-19 J) =4.6227907e-7 = 462 nm tungsten = (6.626e-34 J*s)*(3e8m/s)/(7.16e-19 J) =2.77625698e-7 = 278 nm

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