When mapping the interior of the Sun, astronomers must measure _____ as the photosphere moves up and down
a. Doppler shifts
b. magnetic fields
c. sunspots
d. limb darkening
e. supergranules
a
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Two identical particles, each with a mass of 4.5 ?g and a charge of 30 nC, are moving directly toward each other with equal speeds of 4.0 m/s at an instant when the distance separating the two is equal to 25 cm. How far apart will they be when closest to one another?
a. 9.8 cm b. 12 cm c. 7.8 cm d. 15 cm e. 20 cm
According to Rayleigh, what condition must be met in order for two images to be resolved?
1.The images must be far apart. 2.The device being used to view them must be in focus. 3.The central maximum of one image must fall within the first minimum of the other image, or further out. 4.The sources must be a distance apart from each other related to the wavelength.
Models of the Big Bang that include inflation predict that the overall geometry of the universe should be "flat" (in spacetime). This prediction
A) agrees with data found by studying the cosmic microwave background. B) has been verified by observing the paths of light coming from distant galaxies. C) has been shown to be incorrect by study of the expansion pattern of the universe. D) cannot be tested at this time.
A glider on an air track is connected by a spring to the end of the air track. If it is pulled 3.5 cm in the ?x direction away from its equilibrium point and then released from rest at t = 0, what is the initial phase 
?
A. 0
B. 
C. 
D. 
E. 
F. Some other result (specify)