A Student Looks Through a Transmission Grating at the Light

question 113

Multiple Choice

A student looks through a transmission grating at the light from a helium light source. He sees the red, yellow, and green light from the source superimposed on a meterstick. If the yellow lines are the ones indicated in the figure, then

• A) 1 and 2 are green; 3 and 4 are red.
• B) 1 and 4 are red; 2 and 3 are green.
• C) 1 and 4 are green; 2 and 3 are red.
• D) 1 and 3 are red; 2 and 4 are green.
• E) 1 and 3 are green; 2 and 4 are red.

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