The light-sensitive cells in our eyes that allow us to see color are called ________.
Fill in the blank(s) with the appropriate word(s).
cones
Physics & Space Science
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The highest-strength carbon steels with some ductility have a microstructure described as:
(a) Martensite. (b) Pearlite. (c) Bainite. (d) Tempered martensite.
Physics & Space Science
Negatively charged particles in an atom are called ________.
A. protons B. neutrinos C. electrons D. positrons E. neutrons
Physics & Space Science
Which of the following is NOT an active galaxy?
A. Seyfert galaxies B. QSO's C. radio galaxies D. Attractor voids E. None of these choices is an active galaxy.
Physics & Space Science
How many quarks are in a tritium isotope, H?
A) 2 B) 3 C) 4 D) 6 E) 9
Physics & Space Science