1. The problem statement, all variables and given/known data A stopping potential of 0.50 V is required when a phototube is illuminated with monochromatic light of wavelength 600 nm. Monochromatic light of a different wavelength is now shone on the tube, and the stopping potential is measured to be 1.1V. What is the wavelength of this new light? (c = 3.00 × 108 m/s, e = - 1.60 × 10-19 C, h = 6.626 × 10-34 J · s, 1 eV = 1.60 × 10-19 J) 2. Relevant equations E=h*f (f=c/lambda) h*f=sigma+Ek 3. The attempt at a solution E=h*c/lambda lambda=h*c/E I am just unsure on how to obtain the energy for the new monochromatic light given another. Thankyou!