A magnifier used for reading small print is shaped like a hemisphere 2.0 cm in radius, placed on top of a cylinder of the same radius and 2.0 cm tall. The flat side of the magnifier is placed directly over the print on a book
Where does the image of the print appear to be? (The index of refraction of the magnifier is 1.52.) A)
30.4 cm above the top of the magnifier
B)
12.7 cm above the top of the magnifier
C)
32.1 cm below the top of the magnifier
D)
12.5 cm below the top of the magnifier
E)
at the center of the hemisphere
D
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A hydrogen atom emits a photon as it makes a transition from the n = 4 state to the n = 3 state. The energies of these two states are –0.9 eV and –1.5 eV, respectively. (a) What is the energy of the photon? (b) What is its frequency?
All waves transfer ______________
Fill in the blank(s) with correct word
A uniform 100-lb beam is held in a vertical position by a pin at its lower end and a cable at its upper end. A horizontal force (magnitude P) acts as shown in the figure. If P = 75 lb, what is the tension in the cable?
a.
54 lb
b.
69 lb
c.
47 lb
d.
61 lb
e.
75 lb