If Barium Has a Work Function of 2

question 34

Multiple Choice

If barium has a work function of 2.60 eV,what is its cutoff wavelength when used as a phototube target? (h = 6.63 x 10^-34 J*s,c = 3.00 x 10⁸ m/s,1 eV = 1.60 x 10^-19 J and 1 nm = 10^-9 m)

• A)398 nm
• B)478 nm
• C)497 nm
• D)596 nm

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