What is the spectral type of the Sun?
A) K9
B) G2
C) F7
D) A2
B
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The key to identifying a black hole candidate in a binary system is that
A) one of the two stars cannot be seen. B) the unseen companion in the system must have a sufficiently high mass. C) the unseen star is a contact binary. D) the system must be a very strong source of radio emissions. E) the visible companion must be an evolving main sequence or giant star.
When you stand in front of a convex mirror, the image you see is
A. real and inverted. B. real and upright. C. virtual and inverted. D. virtual and upright. E. real and inverted if your distance from the mirror is greater than two focal lengths.
A proton with a kinetic energy of 0.20 keV follows a circular path in a region where the magnetic field is uniform and has a magnitude of 60 mT. What is the radius of this path?
A. 4.1 cm B. 2.9 cm C. 3.4 cm D. 5.1 cm E. 2.4 cm
There are ground-based telescopes much larger than Hubble, yet the HST still reveals the faintest objects yet seen. Explain
What will be an ideal response?