The objective of an astronomical telescope has a focal length of 900 mm. The telescope has eyepieces of focal lengths 20 mm, 15 mm, and 10 mm. What is the highest magnification for this telescope?
a. 
b. 
c. 
d. 
e. 
e.
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An electron undergoes a collision with a proton. In the center of mass system, the energy of the electron is 4000 MeV. What is the energy of the electron in the lab system, where the proton is at rest before the collision?
A) 34 GeV B) 37 GeV C) 40 GeV D) 43 GeV E) 46 GeV F) 52 GeV
The Local Group is slightly more than _____ in diameter
A) 1 Mpc B) 2 Mpc C) 3 Mpc D) 4 Mpc
A hidden link that looks like body text until point to it, at which time it changes color is a(n) ______ link.
A. hot spot B. formatted C. image D. rollover
For the wave described by y = 0.02 sin (kx) at t = 0 s, the first maximum at a positive x coordinate occurs where x = 4 m. Where on the positive x axis does the second maximum occur?
a. 20 m b. 18 m c. 24 m d. 28 m e. 16 m