3. In a double slit experiment with a source of monoenergetic electrons, detectors are placed along a vertical screen parallel to y-axis. When only slit 1 is open, the amplitude of electrons detected on the screen is tby). Similarly, when only slit 2 is open, the amplitude of electrons detected on the screen is 1122(y). Specify the total intensity and draw the plot (with complete diagram of slits and detector placed a distance away from the slits) of the intensity observed on the screen for the following two cases. ..... (2 + 2 + 2 = 5 marks) (a) When only slit 1 is open. (b) When both slits are open. (c) When only slit 1 is open with the source being stream of bullets instead of electrons