A Light Beam Is Shining on a Metal Target That

question 93

Multiple Choice

A light beam is shining on a metal target that has a work function of 1.8 eV.If a stopping potential of 0.7 V is required,what is the wavelength of the incoming monochromatic light? (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)497 nm
• B)166 nm
• C)796 nm
• D)1130 nm
• E)​691 nm