When it is summer at the south pole,
a. the northern hemisphere is tilted toward the sun.
b. both the southern and northern hemispheres are tilted toward the sun.
c. the southern hemisphere is tilted away from the sun.
d. the northern hemisphere is tilted away from the sun.

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.