A sodium light (? = 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
E
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When looking at an object through a magnifier, the focused image you see is
A. Upright and real B. Inverted and real C. Upright and virtual D. Inverted and virtual
A spherical vessel 0.3-m in diameter is located in a large room whose walls are at 27°C (see sketch). If the vessel is used to store liquid oxygen at –183°C and both the surface of the storage vessel and the walls of the room are black, calculate the rate of heat transfer by radiation to the liquid oxygen in watts and in Btu/h.
GIVEN
• A black spherical vessel of liquid oxygen in a large black room
• Liquid oxygen temperature (To) = –183°C = 90 K
• Sphere diameter (D) = 0.3 m
• Room wall temperature (Tw) = 27°C = 300 K
FIND
• The rate of radiative heat transfer to the liquid oxygen in W and Btu/h
ASSUMPTIONS
• Steady state prevails
• The temperature of the vessel wall is the same as the temperature of the oxygen
SKETCH
PROPERTIES AND CONSTANTS
The Stefan-Boltzmann constant (?) = 5.67 ? 10–8 W/(m2 K4)
When a drawn bow of potential energy 40 J is fired, the arrow will ideally have a kinetic energy
A) less than 40 J. B) more than 40 J. C) of 40 J.
The saying "The present is the key to the past" is a simple way to state the basic geologic concept of ______________
Fill in the blank(s) with correct word