Which kind of electromagnetic radiation has a wavelength that is about the size of a person?
A. ultraviolet
B. infrared
C. radio
D. X-ray
E. visible
Answer: C
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In the above model of an atom, where is the neutron located, assuming a neutron is present?
a. A
b. 1
c. 2
d. 3
You and a classmate are discussing how much work one must do to lift a box of mass m a vertical distance h. Your classmate argues, “You have to exert an upward force on the box at least equal in magnitude to the box’s weight 
, and you lift the box upward a distance h, so you must do work equal to 
. But in addition,” your classmate continues, “ you must increase the box’s gravitational potential energy by 
to lift the box.” What amount of work do you think you need to do on the box to lift it a height h? Be prepared to defend your response. (Hint: What is the system here?)
A. Zero work
B. About 
(if you move the box slowly)
C. Significantly greater than 
but less than 
D. About 
(if you move the box slowly)
E. Significantly greater than 
Sometimes on a hot day a distant dry street appears wet, which is due to
A) water from a previous rainfall. B) reflection of the sky from the street. C) refracted sky light.
In typical globular clusters, the brightest stars are ________
Fill in the blank(s) with correct word