Which produces a greater tidal effect in your body, the Moon or a 1-kg melon held at arm's length above your head?
A) the Moon
B) the melon
C) both about equally
Answer: B
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The F in FM radio stands for
A) frequency. B) forced vibration at which resonance occurs. C) foul. D) female. E) fax.
Within the last two and a half billion years, how many snowball Earth events have occurred?
A) zero B) one C) two D) four
In each of the cases (a) and (b) shown below the electric and magnetic fields in an electromagnetic wave point in the directions shown as the wave passes a certain point P. [ 
points away from the viewer in case (b).] 
In which direction is the wave moving?
A. A B. B C. C D. D E. Toward the viewer F. Away from the viewer T. This is impossible.
A 1.00 mW laser produces photons of wavelength 633 nm. How many photons per second does the laser emit?
a. 
b. 
c. 
d. 
e. 