What problem is adaptive optics designed to correct?
A) the opacity of the Earth's atmosphere
B) defects in the optical figuring, such as with the adaptive optics on HST
C) slight tracking errors in trying to compensate for our unsteady rotation
D) the effects of atmospheric turbulence
E) the absorption of ultraviolet by the ozone layer
D
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If a magnet produces a force on a current-carrying wire, the wire
A) produces a force on the magnet. B) may or may not produce a force on the magnet. C) none of these
An 18 mm wide diffraction grating has rulings of 710 lines per mm. Light is incident normally on the grating. Monochromatic light of 506 nm wavelength is used. The largest angle from the normal at which an intensity maximum is formed is closest to:
A) 46° B) 44° C) 42° D) 40° E) 38°
One mole of an ideal gas at 1.00 atm and 0.00°C occupies 22.4 L. How many molecules of an ideal gas are in one cm3 under these conditions?
a. 28.9 c. 2.69 × 10^19 b. 22,400 d. 6.02 × 10^23
Sirius is a star with spectral type A and Rigel is a star with spectral type B. What can we conclude?
A) Sirius has a higher core temperature than Rigel. B) Sirius has a higher surface temperature than Rigel. C) Rigel has a higher surface temperature than Sirius. D) Rigel has a higher core temperature than Sirius.