Suppose you want to observe and study the radiation from gas inside an interstellar bubble created by a supernova. Which of the following observatories will be most useful?
A) the Chandra X-ray Observatory
B) the Keck I telescope on the summit of Mauna Kea
C) the Hubble Space Telescope
D) the SOFIA airborne infrared observatory
A
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The eccentricity of a planet's orbit describes
a. westward motion in the night sky when observed on successive nights. b. the deviation in shape when compared to a circle. c. its tilt with respect to the ecliptic plane. d. the tilt of the planet's rotational axis with respect to the ecliptic.
A charge of 20 nC is distributed uniformly along the y axis from y = 0 to y = 4 m. Which of the following integrals is correct for the electric potential (relative to zero at infinity) at the point x = +3 m on the x axis?
A.
B.
C.
D.
E.
The Bohr model of the hydrogen atom predicts an ionization energy of 13.6 eV. Using this model, what would we expect for the ionization energy of the Li++ ion, which has 3 protons?
A) 40.8 eV B) 54.4 eV C) 79.6 eV D) 122 eV E) 27.2 eV
How are standard candles used to measure distance?
What will be an ideal response?