Where did comets that are now in the Oort cloud originally form?
A) near the jovian planets
B) outside Neptune's orbit
C) inside Jupiter's orbit
D) within the solar nebula, but far outside the orbit of Pluto
E) all of the above
A
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A. acceleration B. volume C. pressure D. temperature E. inertia
Why do sunspots appear dark in pictures of the Sun?
A) They actually are fairly bright, but appear dark against the even brighter background of the surrounding photosphere. B) They are too cold to emit any visible light. C) They are holes in the solar surface through which we can see through to deeper, darker layers of the Sun. D) They are extremely hot and emit all their radiation as X rays rather than visible light.
Spectroscopic parallax is more accurate than trigonometric parallax for nearby stars
Indicate whether the statement is true or false
A cyclotron operates at 10 MHz. What magnetic field is needed to accelerate protons?
A) 0.12 T B) 0.25 T C) 0.66 T D) 1.3 T E) 1.5 T