If the Work Function of Thoriated Tungsten Is 4 $\times$ 10^-19 J,the Longest Wavelength of Light That Will Cause Photoelectrons

question 52

Multiple Choice

If the work function of thoriated tungsten is 4 $\times$ 10^-19 J,the longest wavelength of light that will cause photoelectrons to be emitted is approximately

• A)880 nm
• B)400 nm
• C)495 nm
• D)700 nm
• E)181 nm

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