When a light wave enters into a medium of different optical density
A) its speed and frequency change.
B) its speed and wavelength change.
C) its frequency and wavelength change.
D) its speed, frequency, and wavelength change.
B
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Estimate the surface area of an adult human’s head.
A. 0.05 
B. 0.1
C. 0.05
D. 0.01
You may have noticed that when you get out of a swimming pool and stand dripping wet in a light breeze, you feel much colder than you feel after you dry off. Why is this?
A) The moisture on your skin has good thermal conductivity. B) Water has a relatively large heat capacity. C) This is a purely psychological effect resulting from the way in which sensory nerves in the skin are stimulated. D) The water on your skin is colder than the surrounding air. E) 540 calories of heat are required to evaporate each gram of water from your skin, and most of this heat flows out of your body.
What would Earth's average surface temperature be if it had no greenhouse effect?
A) below the freezing point of water B) slightly above the freezing point of water C) about 10°C D) the same temperature as it is with the greenhouse effect E) slightly warmer than it is with the greenhouse effect
When an atom emits light, an electron in it moves from a higher to a lower energy level.
Answer the following statement true (T) or false (F)