Use the following figure for the next two questions. Apparatus for studying the photoelectric effect -The work function of the material being investigated is 3.5 $\times$10^-19 J.The battery is set at 1.5 V.What is the longest wavelength of light needed to produce an electric current from the cathode (C)to the anode (A)? A)337 nm B)354 nm C)620 nm D)827 nm E)None of these is correct.

Question

Quizplus · Accepted Answer

The longest wavelength of light needed to produce an electric current from the cathode (C) to the anode (A) is given by the equation:hc/λ = Φ + eVwhere h is Planck's constant, c is the speed of light, λ is the wavelength of light, Φ is the work function of the material, e is the charge of an electron, and V is the voltage of the battery.Substituting the given values into the equation, we get:(6.626 x 10^-34 J s)(3 x 10^8 m/s)/λ = (3.5 x 10^-19 J) + (1.6 x 10^-19 C)(1.5 V)λ = 337 nmTherefore, the longest wavelength of light needed to produce an electric current from the cathode (C) to the anode (A) is 337 nm.

Use the Following Figure for the Next Two Questions ×\times× 10-19 J

Use the Following Figure for the Next Two Questions $\times$ 10^-19 J