Sodium's emission lines at 589.0 nm and 589.6 nm pass through a diffraction grating and form two m = +1 maxima on a viewing screen. For which situation would the spacing between the two lines increase?
a. The grating is exchanged for one having fewer lines per millimeter
b. The grating is exchanged for one with twice the total number of lines.
c. The maxima are viewed in second order.
d. The intensity of the light is doubled.
c
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