Helium-neon laser light (? = 6.33 × 10^?7 m) is sent through a 0.30-mm-wide single slit. What is the width of the central maximum on a screen 1.0 m from the slit?
a. 2.0 cm
b. 4.2 mm
c. 1.1 cm
d. 2.0 mm
e. 0.70 mm
b
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Violent impacts of infalling particles release energy called ____________
Fill in the blank(s) with correct word
The drawing below is supposed to be a free-body diagram of a box that sits without slipping on the back of a truck that is moving to the right but is slowing down. Is the diagram correct?
A. Yes.
B. No, 
should point leftward.
C. No, the label should be .
D. No, there should be a leftward drag force.
E. No, 
should not be equal to 
.
F. No, there is some other problem (specify).
Galaxies with disks but no evident spiral arms are called
A) irregular galaxies. B) lenticular galaxies. C) barred spiral galaxies. D) spheroidal components.
From a latitude of 60 degrees north during the winter, the Sun will
A) spend most of each day below the horizon. B) spend most of each day above the horizon. C) never be seen above the horizon. D) end a few weeks continuously below the horizon.