When a positronium atom (electron + positron) decays, it emits two photons. What are the energies of the photons?
A)
0.511 MeV and 1.022 MeV
B)
0.225 MeV and 1.022 MeV
C)
0.225 MeV and 0.285 MeV
D)
0.256 MeV and 0.256 MeV
E)
0.511 MeV and 0.511 MeV
E
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Two spheres are made of conducting material. Sphere #2 has twice the radius of Sphere #1 . What is the ratio of the capacitance of Sphere #2 to the capacitance of Sphere #1? a. 1, since all conducting spheres have the same capacitance
b. 2 c. 4 d. 8 e. A single sphere has no capacitance since a second concentric spherical shell is necessary to make a spherical capacitor. Thus, none of the answers above is correct.
The magnetic field lines about a straight current-carrying wire are
A) circular. B) radial. C) elliptical. D) spiral.
What are Sun grazers?
a. asteroids that impact the Sun b. meteors that impact the Sun c. any celestial body that orbits the Sun d. asteroids that come in close proximity to the Sun e. comets that come in close proximity to the Sun
What is the period of revolution of a planet in circular orbit around a star of 4.0 solar masses if it is at a distance from the star equal to that of the Earth from the Sun?