Sodium's Emission Lines at 589

question 10

Multiple Choice

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.

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