21. What is the most likely outcome of decreasing the frequency of incident light on a diffraction grating? A. lines become narrower
B. distance between lines increases
C. lines become thicker
D. distance between lines decreases

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.