HII regions are found near stars cooler than 25,000 K because large amounts of ultraviolet photons would totally destroy the hydrogen atoms in the gas
Indicate whether the statement is true or false
F
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The distance between adjacent galaxies in a typical cluster is about ________ times the size of a typical galaxy
A) two or three B) five or less C) ten to twenty D) a hundred E) a thousand
The energy attributed to an object by virtue of its motion is known as ________
A) radiative energy B) kinetic energy C) potential energy D) mass-energy
If you walk towards a mirror at a certain speed, the relative speed between you and your image is
A) half your speed. B) your speed. C) twice your speed. D) none of the above
The finite wire shown below has a uniformly distributed negative charge. Which of the arrows below is closest to the direction of the field vector that the wire produces at point P? (Point to a letter on the back cover with two fingers to specify a double-letter answer.)
A. A
B. B
C. C
D. D
E. AA
F. BBG. CC
H. DD