What principle states that each point on a spherical wavefront may be considered as the source of a secondary spherical wavefront?
A. Faraday's
B. Huygens's
C. Ohm's
D. Maxwell's
B
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In warm weather, concrete block should not be laid on the footing until _____ have/has passed.
A. two weeks B. one week C. 3 days D. 48 hours
In a rack and pinion steering gear, the tie rods are connected to the rack.
Answer the following statement true (T) or false (F)
The vegetable oil with the highest yield in gallons per acre is _______________
Fill in the blank(s) with the appropriate word(s).Heat treatment is common in processing of semiconductor material. A 200-mm-diameter silicon wafer with thickness of 725 µm is being heat treated in a vacuum chamber by infrared heat. The surrounding walls of the chamber have a uniform temperature of 310 K. The infrared heater provides an incident radiation flux of 200?kW/m2 on the upper surface of the wafer, and the emissivity and absorptivity of the wafer surface are 0.70. Using a pyrometer, the lower surface temperature of the wafer is measured to be 1000 K. Assuming there is no radiation exchange between the lower surface of the wafer and the surroundings, determine the upper surface temperature of the wafer. (Note: A pyrometer is a noncontacting device that intercepts and measures thermal radiation. This device can be used to
determine the temperature of an object’s surface.)
