The type of mineral formed is determined by
A) crystallization.
B) the elements present and the conditions that lead to formation.
C) silica content.
D) chemical bonding.
Answer: B
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Angular momentum __________ conserved
Fill in the blank(s) with correct word
The Balmer lines correspond to wavelengths in the ________ part of the spectrum of a(n) ________ atom.
A. X-ray; helium B. ultraviolet; helium C. visible; hydrogen D. infrared; hydrogen
A sports car and a moving van move at the same speed when they crash into a cement wall and stop equally quickly. The vehicle to have the greater force of impact will be
1) the sports car, 2) the van, 3) neither, for they experience equal forces of impact because 4) they are traveling at the same speed. 5) the van's momentum is much greater. 6) the sport car has a greater change in velocity upon impact. 7) they both have equal momentum.
Which of the following is one important reason why most large astronomical telescopes are reflecting telescopes rather than refracting telescopes?
A) Reflecting telescopes have their heaviest component (the mirror) at the bottom rather than the top of the telescope's tube. B) Reflecting telescopes take up less space than refracting telescopes. C) Reflecting telescopes are taller than refracting telescopes. D) For a mirror and lens of the same diameter, a mirror will collect more light.