An Ultraviolet Light Beam Having a Wavelength of 217 Nm

question 17

Multiple Choice

An ultraviolet light beam having a wavelength of 217 nm is incident on a molybdenum surface with work function of 4.9 eV.What is the stopping potential? (h = 6.63 × 10−³⁴ J⋅s,c = 3.00 × 10⁸ m/s,1 eV = 1.6 × 10−¹⁹ J,and 1 nm = 10−⁹ m)

• A)10.6 V
• B)5.3 V
• C)0.8 V
• D)0.4 V
• E)​5.7 V

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