If only 25 percent of the light produced by an emitter is received by the detector due to unclear air, an excess gain of __________ is required to overcome the loss of light.
A. 1´
B. 2´
C. 4´
D. 8´
Answer: C
You might also like to view...
The olm is basically deaf
Indicate whether the statement is true or false
Sugar beets contain 50 percent sugar at harvest
Indicate whether the statement is true or false
What force is primarily responsible for piston ring seal?
A. Cylinder pressure. B. Radial ring pressure. C. Crankcase pressure. D. Oil viscosity.
Refer to the actuator of Figure P18.16. The entire device is made of sheet steel. The coil has 2,000 turns. The armature is stationary so that the length of the air gaps, g = 10 mm, is fixed. A direct current passing through the coil produces a flux density of 1.2 T in the gaps. Assume ?r = 4,000 for sheet steel. Determine:
a. The coil current.
b. The energy stored in the air gaps.
c. The energy stored in the steel.
