While observing the Sun, you note a large number of sunspots. What can you conclude?
A) The Sun is less luminous than usual.
B) This is a period of low solar activity.
C) Earth's climate will be unusually cold.
D) The Sun's rotation is slower than average.
E) There are likely to be an above average number of flares and prominences.
E
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According to the de Broglie hypothesis, which of the following statements is applicable to the wavelength of a moving particle?
a. directly proportional to its momentum b. inversely proportional to its energy c. inversely proportional to its momentum d. directly proportional to its energy
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If two collinear vectors 
and 
are added, the resultant has a magnitude equal to 4.0. If is subtracted from , the resultant has a magnitude equal to 8.0. What is the magnitude of ?
A. 2.0
B. 3.0
C. 4.0
D. 5.0
E. 6.0
The angular magnification of a refracting telescope is 40 x. When the object and final image are both at infinity, the distance between the eyepiece and the objective is 143.5 cm. The telescope is used to view a distant radio tower
The real image of the tower, formed by the objective, is 6.0 mm in height. The focal point of the eyepiece is positioned at the real image. What is the focal length of the objective lens? A) 137 cm B) 138 cm C) 139 cm D) 140 cm E) 141 cm
If a = 1.0 cm, b = 3.0 cm, and I = 30 A, what is the magnitude of the magnetic field at point P?
A. 0.62 mT B. 0.59 mT C. 0.35 mT D. 0.31 mT E. 0.10 mT