When a positronium atom decays, it emits two photons. What are the energies of the photons?
A) 0.225 MeV and 0.285 MeV
B) 0.511 MeV and 1.022 MeV
C) 0.256 MeV and 0.256 MeV
D) 0.511 MeV and 0.511 MeV
E) 1.02 GeV and 938. MeV
D
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Suppose two stars are separated in the sky by 0.1 arcseconds. If you take a picture of them with the SOAR telescope, which has an angular resolution of 0.6 arcsecond, what will you see?
A) one point of light that is the blurred image of both stars B) two separate points of light C) nothing at all
An object is placed at the center of curvature of a concave mirror. The image is
a. inverted, real, and the same size as the object. b. virtual and the same size as the object. c. virtual and smaller than the object. d. virtual and enlarged. e. erect, real, and the same size as the object.
Jupiter does not have
a. a hot interior. b. convection occurring in its atmosphere. c. crustal plates on its surface. d. a dynamo effect. e. any rings.
The Mars Curiosity rover, landed on the surface of Mars using
A) balloons B) a skycrane C) parachutes D) airbags