Many of the brightest stars we see are only a few million years old
Indicate whether the statement is true or false
TRUE
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A light ray goes through two thick rectangular slabs of glass, each of the same uniform thickness. The first slab has index of refraction n1 and the second n2 . If n1< n2. How does the original angle of incidence 
into the first slab compare to the final angle of refraction where the ray leaves the second slab going back into air?
A. 
B. 
C. 
D. 
E. more information is needed
In addition to the asteroid belt, some meteorites come from the Moon and even Mars
Indicate whether the statement is true or false
What direct evidence do we have that the weak and electromagnetic forces were once unified as a single electroweak force?
A) The most advanced telescopes are able to see back to this era in the universe. B) Detectors on Earth have received photons and high-energy particles from this era. C) Temperatures in the center of the Sun can reproduce the conditions during this era. D) Particle accelerators on Earth can reach energies equivalent to the high temperatures of this era and have produced particles predicted by the electroweak theory. E) We have no direct evidence of the electroweak force.
Which of the following elements commonly forms an ion with a 1– charge?
a. Ag b. N c. Br d. Na