In lasers, YAG stands for
A. yellow argon gold.
B. yearly age group.
C. yttrium assisted gain.
D. yttrium aluminum garnet.
E. yttrium antimony gain.
D. yttrium aluminum garnet.
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_____ was a type II supernova that was produced by the explosion of a hot, blue supergiant
A) SN 1572 B) SN 1604 C) SN 1987A D) SNR 1868
The interior of a white dwarf behaves like a degenerate gas, i.e., the temperature has little effect on the pressure.
Answer the following statement true (T) or false (F)
A diver shines light up to the surface of a flat glass-bottomed boat at an angle of 30° relative to the normal. If the index of refraction of water and glass are 1.33 and 1.5, respectively, at what angle (in degrees) does the light leave the glass (relative to its normal)?
a. 26 b. 35 c. 42 d. 22 e. 48
The presence of a magnetic field is a good indication that:
A) the Earth's interior is similar to Mercury's, as both have fields. B) a huge iron meteorite lies somewhere high up in the mantle, not in the core. C) we have a liquid metal outer core, spinning rapidly as we rotate. D) the Earth's interior must be completely molten to the center. E) the Earth's interior has had time to solidify, with a rigid bar magnet created.