The youngest star clusters are ones in which their brightest main-sequence stars have spectral type
A) M.
B) B.
C) A.
D) O.
E) G.
D) O.
You might also like to view...
As a bowling ball that rolls off the edge of a table falls, its vertical component of motion
A) decreases. B) remains constant. C) increases.
As a high-altitude balloon sinks lower and lower into the atmosphere it undergoes a decrease in
A) volume. B) density. C) weight. D) mass. E) none of the above
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.
A certain nucleus containing 8 protons and 7 neutrons has a radius R. Which of the following values would be closest to the expected value of the radius of a nucleus having 51 protons and 69 neutrons?
A) 1.85R B) 2.00R C) 2.14R D) 6.38R E) 8.00R