Which of the following gases absorbs ultraviolet light best?
A) carbon dioxide
B) nitrogen
C) oxygen
D) hydrogen
E) ozone
E
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Thin Films: A sodium light, having wavelength 589.3 nm, is used to view a soap film to make it look black when directed perpendicular to the film. What is the minimum thickness of the soap film if the index of refraction of soap solution is 1.38?
A. 114 nm B. 194 nm C. 294 nm D. 314 nm E. 214 nm
Resolution: A camera used for aerial mapping has a lens with a 30-cm diameter maximum aperture and a 42-cm focal length. Light of 550 nm wavelength is used to form the image. Assuming that the resolution of the camera is limited only by diffraction, what is the smallest angle (in milliradians) subtended by an object on the ground that can be resolved by this camera at maximum aperture?
A. 1.6 mrad B. 2.2 mrad C. 3.2 mrad D. 4.5 mrad E. 6.3 mrad
?The theorem of equipartition of energy states that the energy each degree of freedom contributes to each molecule in the system (an ideal gas) is
A.
B.
C.
D.
E.
Two large parallel plates are separated by 1.0 mm of air. If the potential difference between them is 3.0 V, what is the magnitude of their surface charge densities? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 2.7 × 10-8 C/m2 B) 1.6 × 10-4 C/m2 C) 5.3 × 10-8 C/m2 D) 3.3 × 10-4 C/m2