Why do sunspots appear dark in pictures of the Sun?
A) They are too cold to emit any visible light.
B) They are holes in the solar surface through which we can see through to deeper, darker layers of the Sun.
C) They are extremely hot and emit all their radiation as X-rays rather than visible light.
D) They actually are fairly bright, but appear dark against the even brighter background of the surrounding photosphere.
D
You might also like to view...
In a Young's experiment, the paths from the slits to a point on the screen differ in length causing constructive interference at the point. Which of the following path differences would cause this constructive interference?
a. 5?/2 b. 3?/4 c. 4? d. None of the above.
What information does a star's Greek-letter designation convey?
What will be an ideal response?
The SI units of velocity are
a. mi/h b. km/h c. m/s2 d. m/s e. none of the above
Which has the lowest average density?
a) Mercury b) Venus c) Uranus d) Mars e) the Moon