Which element is the dead end for cores of the most massive stars?
A) lead B) oxygen C) uranium D) hydrogen E) iron
E
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What are some advantages of radio telescopes over optical scopes?
What will be an ideal response?
A pair of crossed Polaroids will transmit light
A) of sufficiently long wavelengths. B) that itself is polarized. C) if a third Polaroid at about 45 degrees is inserted between the two.
Energy Levels: The shortest wavelength of a photon that can be emitted by a hydrogen atom, for which the initial state is n = 12, is closest to which one of the following values? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 92 nm B. 82 nm C. 72 nm D. 62 nm E. 52 nm
A 4000-? resistor is connected across a 220-V power source. What is the current through the resistor?
A) 0.055 A B) 1.8 A C) 5.5 A D) 18 A