Optical pumping of a ruby laser is done with photons absorbed at energy 2.25 eV. The laser light consists of photons of energy 1.79 eV in a transition that goes to ground. What is the energy of the transition from the pumped stated to the lasing state?
A. 2.25 eV
B. 1.79 eV
C. 4.04 eV
D. 0.460 eV
E. 1.30 eV
D. 0.460 eV
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A convex mirror has a focal length of magnitude f. An object is placed in front of this mirror at a point f from the face of the mirror. The image will appear
A) behind the mirror. B) upright and reduced. C) upright and enlarged. D) inverted and reduced. E) inverted and enlarged.
What is the net force on a 10-kg solid steel sphere falling in air at terminal speed?
a. 980 N b. 200 N c. 98 N d. 49 N e. Some value other than those given above.
A water pipe with inner radius r1 is connected to a junction with two equal-diameter pipes. Water flows through each of the two pipes with a speed of v. If the diameter of each of the two pipes is ΒΌ the diameter of the single pipe, what is the flow rate in the single pipe?
a. v/8 b. v/4 c. 4v d. 8v
What type of heat transfer is used to carry heat from the house furnace to the living room of most houses?
A. natural convection of air falling over the cooling land B. forced convection air or force convection of water C. forced convection of water D. natural convection of air rising over the warming land