8-46. Winds flowing in a circular path are 

 influenced by the 



1. Coriolis effect, pressure gradient 

 force, and centrifugal effect 



2. centripetal effect, Coriolis effect, 

 and pressure gradient 



3. centrifugal effect, speed, and 

 centripetal effect 



4. Coriolis effect, speed, and cen- 

 tripetal effect 



8-47. In accordance with Bernoulli's theorem, 

 the pressure of a flowing gas is 



1. directly proportional to its velocity 



2. inversely proportional to its 

 velocity 



3. always equal to its velocity 



4. unaffected by its velocity 



Learning Objective: Recognize the 

 characteristics of light, the 

 effects of light striking various 

 substances, the meaning of trans- 

 parent and opaque as they apply to 

 various substances, the measurement 

 of the intensity of light, the mean- 

 ing and characteristics of normal, 

 incident, reflected, and diffused 

 rays, and identify atmospheric 

 light-related phenomena. 



8-48. The characteristics of light differ from 

 other regions of the electromagnetic 

 spectrum because of light's 



1. frequency only 



2. speed only 



3. wavelength only 



4. frequency, speed, and wavelength 



8-49. Frequency of a light ray is defined as 



1. the distance from the crest of one 

 wave to the crest of the following 

 wave 



2. the number of waves passing a given 

 point in a specified time 



3. the distance from a point on one 

 wave to a corresponding point on the 

 next wave 



4. the distance from the trough of one 

 wave to the trough of the following 

 trough 



8-50. Which of the following is most descrip- 

 tive of the manner in which any substance 

 reacts to light? 



1. It absorbs only 



2. It reflects only 



3. It reflects or absorbs only 



4. It transmits, reflects, or absorbs 



8-51. An object that passes virtually 100 per- 

 cent of the light striking it exhibits 

 the property of 



1. opacity 



2. translucency 



3. transparency 



4. absorptivity 



8-52. When none of the light waves which strike 

 a medium are transmitted, the medium is 

 termed 



1. opaque 



2. absorbent 



3. translucent 



4. transparent 



8-53. The basic measurement for determining 



the luminous intensity of a light source 

 is the 



1 . lumen 



2. foot-candle 



3. candlepower 



4. lumen second 



8-54. The imaginary line perpendicular to the 



mirror at the point where the ray strikes 

 is referred to as the 



1. angle of reflection 



2. angle of incidence 



3. Normal 



4. reflected light 



8-55. If light strikes a surface at an angle of 

 45°, at what angle will the light be 

 reflected away from that surface? 



1. 90° 



2. 60° 



3. 45° 



4. 30° 



8-56. When will light rays bend toward the 

 normal when they pass from one trans- 

 parent substance to another? 



1. When they enter the second substance 

 at an angle of less than 90° 



2. When they enter the second substance 

 at an angle of 90° or more 



3. When the second substance is more 

 dense than the first 



4. When the second substance is less 

 dense than the first 



8-57. Refer to figure 12-17 in your textbook. 

 Sunlight glancing from the ripples on a 

 lake is an example of 



1. regular reflection 



2. diffused reflection 



3. specular reflection 



4. incident transmission 



49 



