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.
E
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What will be an ideal response?
John rapidly pulls a plunger out of a cylinder. As the plunger moves away, the gas molecules bouncing elastically off the plunger are
a. rebounding at a higher speed than they would have if the plunger weren't removed. b. rebounding at a lower speed than they would have if the plunger weren't removed. c. rebounding at the same speed as they would have if the plunger weren't removed. d. Whether they speed up or slow down depends on how fast the plunger is removed.
Two slits are illuminated with green light (l = 540 nm). The slits are 0.05 mm apart and the distance to the screen is 1.5 m. At what distance (in mm) from the central maximum on the screen is the average intensity 50% of the intensity of the central maximum?
a. 1 b. 3 c. 2 d. 4 e. 0.4
Light from a laser is
1) monochromatic. 2) in phase. 3) coherent. 4) all of the above. Compared to the energy put into a laser, the energy of the laser beam is 5) usually much more. 6) much less. 7) the same.