Given that organic molecules need to react in order to produce life, this suggests we should search for worlds in the solar system that have
A) either an atmosphere, or a surface or subsurface liquid medium such as water, or both.
B) organic molecules on their surfaces
C) an atmosphere
D) rocky surfaces
A
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An electron in a hydrogen atom has principal quantum number n = 4. How many possible values of the orbital quantum number l could it have?
A) 8 B) 9 C) 3 D) 4 E) 10
Light with a wavelength of 450 nm shines through a lens with an aperture diameter of 0.85 cm. Use Rayleigh's criterion to determine the limiting angle of resolution. (1 nm = 10-9 m)
a. 6.5 × 10^-5 rad c. 9.2 × 10^-5 rad b. 1.3 × 10^-4 rad d. 3.0 × 10^-9 rad
When a superconductor's temperature drops below the critical temperature, its resistance:
a. equals that of a semiconductor of equal dimensions. b. drops to zero. c. reduces to one half. d. increases by two.
Normal atmospheric pressure is
a. 14.7 psi b. 1 N/m2 c. zero d. 760 mm of mercury e. 101,000 pascals f. none of the above