If the Work Function of Thoriated Tungsten Is 4 *10^-19

question 60

Multiple Choice

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

• A) 880 nm.
• B) 400 nm.
• C) 497 nm.
• D) 700 nm. E) 181 nm.

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