Which of the following elements would be expected to be most stable?
A) Platinum-195
B) Iron-56
C) Carbon-12
D) Bismuth-209
E) Helium-3
B
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In one way of naming stars, a(n) ____ letter indicates its brightness relative to the other stars in the constellation
a. English b. Arabic c. Greek d. Cyrillic
The apparent magnitude of the Sun is -26, while Sirius has an apparent magnitude of -1; how much brighter does the Sun appear than Sirius?
What will be an ideal response?
A ray of light enters an equilateral prism made of material with n = 1.45 at an angle of incidence 
The internally refracted ray is parallel to the base of the prism. What is the angle of refraction for the ray leaving the prism?
A. 46.5 
B. 30.0
C. 20.2
D. 15.7
E. the ray won't leave the prism
When an unstable nucleus decays by emitting an alpha particle, the atomic mass number A of the nucleus
A) increases by 4. B) increases by 2. C) decreases by 2. D) decreases by 4. E) remains unchanged.