If its density is less than the critical density, then a universe ________.
A. contains only antimatter
B. expands forever
C. never expands
D. will re-collapse
Answer: B
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Camera #1 has a lens with f-number 11 and camera #2 has a lens with f-number 2.8. Which camera has the faster lens (i.e., it can take a properly exposed picture with the shortest exposure time), and which camera will give the greatest depth of field (i.e., the widest range of distances with sharp images)?
1.#1, #1 2.#2, #2 3.#1, #2 4.#2, #1
A bird flies 3.0 km due west and then 2.0 due north. Another bird flies 2.0 km due west and 3.0 KM due north. What is the angle between the net displacement vectors for the two birds?
A. 23 Degrees B. 34 Degrees C. 56 degrees D. 90 degrees
_________ in our atmosphere is a direct consequence of the emergence of life.
a. Carbon dioxide b. Water vapor c. Nitrogen d. Oxygen e. Helium
A two-slit apparatus is covered with a red (660 nm) filter. When white light is shone on the filter, on the screen beyond the two-slit apparatus, there are 9 interference minima within the 4.5 cm-wide central diffraction maximum. When a blue (440 nm) filter replaces the red, how many fringes will there be in the central diffraction maximum?
A. 3 B. 13 C. 9 D. 6