A certain computer chip that is about the size of a postage stamp (2.54 cm x 2.22 cm) contains about 3.5 million transistors. If the transistors are square, what must be their maximum dimension? (Note: Devices other than transistors are also on the chip, and there must be room for the interconnections among the circuit elements. Transistors smaller than 0.7μm are now commonly and inexpensively fabricated.)