Which body continually emits electromagnetic waves?
A) the Sun
B) the Earth
C) you and your classmates
D) all of the above
E) none of the above
Answer: D
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Arriving at a conclusion based upon one's observations is known as:
a. inductive reasoning b. deductive reasoning c. critical thinking d. logic e. the scientific method
Approximately how many radioactive atoms are present in a tritium sample with an activity of 0.6 × 10^-6 Ci and a half-life of 12.3 years? (1 Ci = 3.7 × 10^10 decays/s)
a. 4 × 10^10 c. 7 × 10^8 b. 2 × 10^8 d. 1 × 10^13
Explain what the granulation of the solar surface is related to
What will be an ideal response?
Capacitors in Combination: A potential difference of V = 100 V is applied across two capacitors in series, as shown in the figure. If C1 = 10.0 ?F and the voltage drop across it is 75 V, what is the capacitance of C2? 
A. 30 ?F B. 2.5 ?F C. 7.5 ?F D. 3.3 ?F