Question: if a material is highly opaque, then it

Answer: absorbs most light

Question: when light reflects off an object, what is the relation between the angle of incidence and the angle of reflection?

Answer: angle of incidence = angle of reflection

Question: if a material is transparent, then it

Answer: transmits light well

Question: grass (that is healthy) looks green because

Answer: it reflects green light and absorbs other colors

Question: the frequency of a wave is

Answer: all of the above

Question: how are wavelength, frequency, and energy related for photons of light?

Answer: longer wavelength means lower frequency and lower energy

Question: suppose you built a scale-model atom in which the nucleus was the size of a tennis ball about how far would the cloud of electrons extend

Answer: several kilometers

Question: which of the following statements about electrical charge is true

Answer: a positive charge and a negative charge will attract each other

Question: how much electrical charge does an atom with 6 protons, 6 neutrons, and 5 electrons have

Answer: a positive charge of 1+

Question: if you heat a gas so that collisions are continually bumping electrons to higher energy levels, when the electrons fall back to lower energy levels the gas produces

Answer: an emmission line spectrum