A single slit of width 0.0300 mm is used to project a diffraction pattern of 500 nm light on a screen at a distance of 2.00 m from the slit. What angle does the central maximum subtend as measured from the slit?
a. 
b. 
c. 
d. 
e. 
a.
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If originally there were X atoms of radioactive isotope present and now there are only X/2 atoms, how many half-lives have elapsed?
A) 3 B) 1 C) 4 D) 2
A quasar's spectrum is hugely redshifted. What do most astronomers think this large redshift tells us about the quasar?
A) the composition of the quasar B) the distance to the quasar C) the size of the quasar's central, supermassive black hole D) the type of host galaxy in which the quasar resides
To see his full height, Blinky Bill who is 1 meter tall needs a mirror that is at least
A) 0.33 m tall. B) 0.50 m tall. C) 0.75 m tall. D) 1 m tall. E) depends on distance from the mirror.
Which of the following elements would be expected to be most stable?
A) Platinum-195 B) Iron-56 C) Carbon-12 D) Bismuth-209 E) Helium-3