Magnesium has atomic number 12 . In its ground state, how many electrons are in its n = 3 shell?
a. 2
c. 16
b. 8
d. 10
A
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In M82, observations indicate that there are several bright sources close to the center of the galaxy. These might be
A) supernovae. B) accretion disks of supermassive black holes, millions of times as massive as our sun. C) accretion disks of intermediate black holes, hundreds of times as massive as our sun. D) accretion disks of stellar mass black holes. E) red giants in the process of forming planetary nebulae.
A concave mirror has a focal length of 20 cm. A paraxial beam of light coming from a distant object forms its image at the focal point
If a small plane mirror is placed at the center of curvature with its reflecting side facing the focal point, where is the final image? A) 3 cm in front of the mirror B) 40 cm in front of the mirror C) 50 cm in front of the mirror D) 60 cm in front of the mirror E) 70 cm in front of the mirror
Identical 4.0-?C charges are placed on the y axis at y = ±4.0 m. Point A is on the x axis at x = +3.0 m. Determine the electric potential of point A (relative to zero at the origin)
a. ?4.5 kV b. ?2.7 kV c. ?1.8 kV d. ?3.6 kV e. ?14 kV
The atoms in a molecule are joined together by chemical
A) bonds B) linkages C) attachments D) ligatures