In a photoelectric experiment, the collector plate is at 2.0V with respect to the emitter plate made of copper `(phi)=4.5eV)`. The emitter is illuminated by a source of monochromatic light of wavelength 2000 `Å`nm.
A. The maximum kinetic energy of the photoelctrons reaching the collector is `0`.
B. The maximum kinetic energy of the photoelctrons reaching the collector is `3.7` .eV.
C. If the polarity of the battery is reversed then answer to part A willl be 0
D. If the polarity of the battery is reversed then answer to part B will be `1.7 eV`