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Calcium has a work function of $2.69\text{ eV}$.

What can we conclude about the threshold frequency and wavelength for calcium?

This energy corresponds to a threshold frequency of $6.5\times { 10 }^{ 14 }\text{ Hertz}$ and a wavelength of $460\text{ nm}$.

This energy corresponds to a threshold frequency of $4.06\times { 10 }^{ 14 }\text{ Hertz}$ and a wavelength of $739\text{ nm}$.

This energy corresponds to a threshold frequency of $1.54\times { 10 }^{ -15 }\text{ Hertz}$ and a wavelength of $460\text{ nm}$.

This energy corresponds to a threshold frequency of $4.06\times { 10 }^{ 14 }\text{ Hertz}$ and a wavelength of $195\text{ nm}$.