The main difference between a radio wave and a sound wave is
A) frequency.
B) wavelength.
C) energy.
D) amplitude.
E) basic nature.
Answer: E
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The process of _______________ depends partly on the presence of short-lived radioactive elements whose rapid decay would have released enough heat to melt the interior of planets
Fill in the blank(s) with correct word
The critical density must include both matter and ________
Fill in the blank(s) with correct word
A large vat contains 1.000 L of water at 20°C. What volume will this water occupy when it is heated up to 80°C? Water has a volume expansion coefficient of 210 × 10-6 K-1
A) 1.600 L B) 1.013 L C) 0.987 L D) 0.9987 L
120 J of heat flows by thermal conduction from
to 
What is the change in entropy for this process?
A. 0.034 J/K B. 0.118 J/K C. 0.201 J/K D. 0.338 J/K