The type of EM wave used in aircraft radar is
a. radio waves. b. microwaves.
c. x-rays. d. gamma rays.
b
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White dwarfs are rare objects
a. True b. False Indicate whether the statement is true or false
The mass density of normal air is, at a particular temperature, 
If the average molecular mass of air is 29.0 u, how many air molecules are in spherical balloon of radius 15.0 cm?
a. 
b. 
c. 
d. 
e. 
f. 
To date, we've found few planets orbiting their stars at distances comparable to the distances of the jovian planets in our solar system. Why do astronomers think this is the case?
A) We have not yet been searching for planets at such distances for a long enough time. B) Planets at such distances are extremely rare. C) No known method can detect planets at such large distances. D) Planets at such distances are probably low in mass.
In an RLC series circuit, if the AC frequency is decreased to a very small value, what value does the phase angle between the current and voltage approach?
a. 90° b. 0° c. –90° d. 45°