A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. The black circles are one and two wavelengths from their respective sources. The lighter circles are one-half and one-and-a-half wavelengths distant from their respective sources. If the phase at S1 and S2 is zero at this instant,
and the waves shown arriving at P2 both arrive with amplitude A, the difference in phase angle at point P2 (in radians) is
?
?
a.
0.
b.
?/2.
c.
?.
d.
3?/2.
e.
2?.
c
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A ruby’s red color results from the substitution of _____________atoms for aluminum atoms in a crystal of Al2O3.
Fill in the blank(s) with the appropriate word(s).
When discovered in the 1960's, a(n) ___________ was found to emit large amounts of energy, but through visual and radio telescopes appeared to be a single point of light much like a star
a. a planet like Venus b. E galaxy c. spiral galaxy d. double-lobed radio galaxy e. quasar
Answer the following statement(s) true (T) or false (F)
1. The magnitude of the normal force on a box sitting on an incline is equal to that of its weight.
2. Putting wider tires on your car will clearly give you more traction
3. Assume that the coefficient of static friction between your car’s tires and a certain road surface is about 0.75. Your car can climb a 45° slope.
4. We can express the kinetic friction law in the form 
5. A car with four-wheel drive can climb a steeper slope than a car with two-wheel drive.
On a Hertzsprung-Russell diagram, where would you find stars that are cool and luminous?
A) upper right B) lower right C) upper left D) lower left