help pls

4. A plane wave of light with frequency of 2.0x1015 Hz travels in the +x direction. The E-field has an amplitude of 2400V/m. Etakes on this value at t = O and x = 0 in the -z direction. a) What is the magnitude and direction of the B-field at that same point in space and time? b) What is the wavelength (in nm)? Is this visible, UV or infrared? c) What average energy is contained in a cube 2.0mm on a side within the wave? What is the intensity of the wave (W/mz) d) If the light wave shines directly onto an area of 20.0 m2, how much energy (in J) passes through the area in one-hour. e) Write down the E and B vector fields with numerical values except for the variables x and t, and unit vectors to denote directions