Vision Problems: What power contact lens must be used to correct the vision of a nearsighted person whose far point is 40 cm?
A. +2.5 diopters
B. -2.5 diopters
C. -3.6 diopters
D. -4.0 diopters
E. +4.0 diopters
Answer: B
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From where did the molecular oxygen in Earth's atmosphere originate?
A) photosynthesis from plant life B) photosynthesis from single-celled organisms C) outgassing from volcanoes D) atmospheric bombardment E) oxidation of surface rocks
Two nuclei which share the same atomic number Z always are
a. stable. b. unstable. c. isotopes. d. isobars. e. radioactive.
The Lewis symbol 
would be characteristic of which group?
a.
6A
b.
1A
c.
3A
d.
7A
Using the Rayleigh criterion, one concludes that using fixed wavelength light that it is not possible to resolve details less than about
A) 0.5 wavelength. B) 0.1 wavelength. C) one wavelength. D) 10 wavelengths. E) 122 wavelengths.