Monday, August 13, 2012

physics


Which phenomenon can occur with light, but not with sound? 

A. Doppler effect
B. Interference
*C. Polarization 
D. Refraction

The threshold frequency of a photo emissive surface is 7.0 x 1014 hertz. Which electromagnetic radiation, incident upon the surface, will produce the greatest amount of current? 

A. Low intensity infrared radiation
B. High intensity infrared radiation
C. Low intensity UV radiation
*D. High intensity UV radiation 

 A spherical mirror that forms only virtual images has a radius of curvature of .5 meters. The focal length of this mirror is? 

A. -.125 m
*B. -.25 m 
C. 2.5 m
D. 2.75 m

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