If Barium Has a Work Function of 2

question 79

Multiple Choice

If barium has a work function of 2.6 eV,what is its cutoff wavelength when used as a phototube target? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,1 eV = 1.60 × 10−¹⁹ J and 1 nm = 10−⁹ m)

• A)765 nm
• B)478 nm
• C)777 nm
• D)380 nm

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