Choose the best answer to given of the following. Explain your reasoning with one or more complete sentence.
Radio waves are
(a) a form of sound.
(b) a form of light.
(c) a type of spectrum.

Choose the best answer to given of the following. Explain your reasoning with one or more complete sentence.
Why is a sunflower yellow?
(a) It emits yellow light.
(b) It absorbs yellow light.
(c) It reflects yellow light.

Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly.
If a distant galaxy has a substantial redshift (as viewed from Earth), then anyone living in that galaxy would see a substantial redshift in a spectrum of the Milky Way Galaxy.

Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly.
Galaxies that show redshifts must be red in color.

Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly.
If you could view a spectrum of light reflecting off a blue sweatshirt, you’d find the entire rainbow of color (looking the same as a spectrum of white light).

Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly.
If the Sun’s surface became much hotter (while the Sun’s size remained the same), the Sun would emit more ultraviolet light but less visible light than it currently emits.

Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly.\ A “white hot” object is hotter than a “red hot” object.

Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly.\ Two isotopes of the element rubidium differ in their number of protons.

Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly.\ If you had X-ray vision, you could read this entire book without turning any pages.

What are the four major ways light and matter can interact? Give an example of each from everyday life.

The graph above is a schematic spectrum of the planet Mars; Mars reflects visible sunlight and emits infrared light, refer to the numbered features of the graph and answer the following question.
Which of the six numbered features represents absorption lines?

Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly.\ If you could see infrared light, you would see a glow from the backs of your eyelids when you closed your eyes.

Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly.\ Because of their higher frequencies, X rays must travel through space faster than radio waves.

Decide whether the statement makes sense (or is clearly true) or does not make sense (or is clearly false). Explain clearly.\ The walls of my room are transparent to radio waves.