In what wavelength range was interferometry first routinely used?
A) X-ray B) optical C) infrared D) radio E) ultraviolet
D
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Which of the following is NOT a basic requirement for chemically based life?
A) a liquid medium to transport biological molecules B) a source of molecules from which to build living cells C) oxygen from photosynthesis D) a source of energy to fuel metabolism
You have a choice between two lenses of focal lengths fa and fb = 2 fa to use as objective lens in building a refracting telescope. If the magnification you obtain using lens A is Ma, what will be the magnification when using lens B?
A) Mb = 2 Ma B) Mb = 4 Ma C) Mb = 8 Ma D) Mb = Ma /4 E) Mb = Ma /2
Two singly ionized isotopes, X and Y, of the same element move with the same speed perpendicular to a uniform magnetic field. Isotope X follows a path of radius 3.35 cm while isotope Y moves along a path 3.43 cm in radius. What is the ratio of the two isotope masses, mY/mX?
a. 0.977 c. 1.05 b. 0.954 d. 1.02
An AC power generator produces 25 A (rms) at 3600 V. The energy is transmitted through a long-distance power line, which has a total resistance of 50 W. What percentage of the power delivered by the generator is dissipated as heat in the long-distance line if a step-up transformer is not used?
a. 69% c. 0.09% b. 35% d. 1.8%