uhm the answer is D. sorry if am wrong
From the attached graphic:
e = c*h/wavelength therefore,
wavelength = c*h / e
wavelength = 299,792,458 * 6.62606957e-34 / 3.38x10^-19
wavelength = 5.8771e-7 meters
You would do 40 divided by .50 to get 80 Chips in total.
Y(y + 4) - y2 = 6
y2 + 4y - y2 = 6
4y = 6 ⇒ False