The ratio of the numbers of neutrons to protons in the nucleus of naturally occurring isotopes tends to vary with atomic number in what manner?
a. increases with greater atomic number
b. decreases with greater atomic number
c. is maximum for atomic number = 60
d. remains constant for entire range of atomic numbers
a
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A person uses corrective glasses of power -8.5 D that are worn 2.0 cm from her eye
(a) Is she nearsighted or farsighted? (b) What is her far point without glasses? What will be an ideal response?
Planetary orbits are
a. parabolas c. circles b. ellipses d. none of the above.
Conservation of Momentum: A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the momentum during the collision are correct? (There could be more than one correct choice.)
A. The momentum of the truck is conserved. B. The momentum of the car is conserved. C. The car and the truck must undergo the same change in speed. D. The momentum of the car and the momentum of the truck are each conserved. E. The momentum of the car-truck system is conserved, but the momentum of each one separately is not conserved.
What is the minimum thickness of a coating of magnesium fluoride (n = 1.38) applied to glass (n = 1.50) that gives a minimum reflection for 600 nm light?
A. 600 nm B. 300 nm C. 435 nm D. 109 nm E. 100 nm