The positron was discovered by which of the following physicist
e. Anderson first observed the positron.
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An object of mass m is on the surface of the Earth. The distance to the Sun and the Moon are dS and dM, and the masses of the Sun and Moon are MS and MM. What is the ratio of the gravitational force from the Sun to that of the Moon on the object?
a. MSMM /dSdM b. MSMM /d2Sd2M c. MSd2M /MMd2M d. MMd2S /MSd2M
Alpha radiation is in fact which of the following?
a. high energy quanta c. helium nuclei b. positrons d. electrons
Interactions among galaxies also are thought to influence a galaxy's type in at least some cases. Which of the following does not support the idea that interactions can shape galaxies?
A) the presence of features, such as "tails" extending out of galaxies, bridges between galaxies, and rings of stars around galaxies B) the fact that galaxies with distorted appearances are more common at great distances than nearby C) computer modeling of collisions between galaxies D) the fact that more distant galaxies have larger redshifts
What is a new moon?
a. The lunar phase in which the first quarter Moon approaches full moon b. The lunar phase in which Earth's shadow is cast on the Moon c. The lunar phase in which the Moon's shadow is cast on Earth d. The lunar phase in which sunlight illuminates only the far side of the Moon e. The lunar phase in which sunlight illuminates the Earth facing side of the Moon