The Sun's visible surface (that is, the surface we can see with our eyes) is called the
A) photosphere.
B) chromosphere.
C) corona.
D) core.
A) photosphere.
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Adaptive optics measures and cancels out all seeing distortions that are caused by turbulence in Earth's atmosphere
a. True b. False Indicate whether the statement is true or false
As shown below, a square loop of wire of side a moves through a uniform magnetic field of magnitude B perpendicular to the page at constant velocity 
directed to the right. Which statement regarding the electric field induced in the wires is correct for the wires at the left and right sides of the loop?
?
?
A.
is directed upwards in both the right and left sides of the loop.B.
is directed upwards in the right side and downwards in the left side of the loop.C.
is directed upwards in the left side and downwards in the right side of the loop.D.
is directed downwards in both the right and left sides of the loop.E.
A car is traveling at 26.0 m/s when the driver suddenly applies the brakes, causing the car to slow down with constant acceleration
The car comes to a stop in a distance of 120 m. How fast was the car moving when it was 60.0 m past the point where the brakes were applied? A) 22.5 m/s B) 18.4 m/s C) 15.0 m/s D) 12.1 m/s E) 9.20 m/s
Discuss the discovery of Seyfert galaxies and their observable properties
What will be an ideal response?