An apparent westward motion of a planet in the sky compared to the background stars (as viewed from the Earth) when observed on successive nights is referred to as
a. epicycle
b. retrograde motion
c. prograde motion
d. heliocentric motion
e. deferent
B
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X-rays come from certain regions of the interstellar medium because gas molecules in those regions are at a very high density
a. True b. False Indicate whether the statement is true or false
The slope of a tangent line at a given time value on a position versus time graph gives
A) instantaneous velocity. B) average velocity. C) instantaneous acceleration. D) average acceleration E) none of the given answers.
The Bohr model of the hydrogen atom predicts an ionization energy of 13.6 eV. With this model one would expect the ionization energy of the Li++ ion to be
A) 122.4 eV B) 40.8 eV C) 54.4 eV D) 27.2 eV E) 79.6 eV
At temperatures of ________ K, photons can split apart nuclei until only protons and neutrons are left in photodisintegration
A) ten million B) 100 million C) one billion D) ten billion E) one hundred billion