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3. A photo of wavelength 350 nm is incident on a metal surface. The surface has working function 1.1 eV a) What is the maximum kinetic energy of the ejected electron? b) What is speed of the electron? c) What is the de Broigle wavelength of the electron? 4. Two very long wires carry current 2 A and 5 A, in the same direction. The wires are 50 cm apart from one another a) What is the magnitude and direction of the magnetic field between (at the midpoint of separation) the wires? b) If an electron is placed at that point, but given no initial velocity, what magnetic force will it experience? c) If the initial velocity of the electron is 3000m/s instead, and it is placed at the point from part (a), what will be the magnetic force it experiences? d) What magnitude of electric field would be necessary to ensure that the electron's trajectory is not curved by the magnetic force?