Radioactivity Basics: When a ?- particle is emitted from an unstable nucleus, the atomic number of the nucleus
A. increases by 1.
B. decreases by 1.
C. increases by 2.
D. decreases by 2.
E. does not change.
Answer: A
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What are the advantages in placing the James Webb Space Telescope so far from Earth? Choose all that apply.
A.It will be closer to the objects it seeks to observe. B.There will not be any atmospheric interference. C.Light from the objects it observes will arrive at the telescope more quickly. D.Only a small portion of the sky will be blocked by Earth. E.It is unlikely to be hit by orbiting debris.
Suppose you use the Southern Cross to determine that the south celestial pole appears 40 degrees above your horizon. Then you must be located at
A) latitude 40 degrees north. B) latitude 50 degrees south. C) latitude 40 degrees south. D) longitude 40 degrees.
When two point charges are 2.0 cm apart, each one experiences a 1.0-N electric force due to the other charge. If they are moved to a new separation of 8.0 cm, the electric force on each of them is closest to
A) 1.0 N. B) 4.0 N. C) 16 N. D) 0.25 N. E) 0.063 N.
Which of these is not a possible representation of electric field lines?
A. A
B. B
C. C
D. D