AP (Advanced Placement) Physics(BC): Questions 520  522 of 920
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Question number: 520
Question
In a diffraction experiment performed on a scale where the slit width is fairly large, the angle between bright lines for any set of bright lines becomes very small. In this situation, the diffraction equation, , can take on a simpler form. What is that form, and what is the reason it can be simplified?
Choices
Choice (5)  Response  

a.  , Because is almost equal to for very small angles. 

b.  , Because the ratio of to is very close to . 

c.  , Because sin and tan are almost equal for very small angles. 

d.  , Because when the angle is small, the functions are the same for all values of m. 

e.  All of the above 

Question number: 521
Question
A convex lens of focal length is placed coaxially in constant with a concave lens of focal length . What is the power of the combination?
Choices
Choice (5)  Response  

a. 


b. 


c. 


d. 


e.  All of the above 

Question number: 522
Question
How much elongation of a wire long so that the strain is of ? if the wire has cross – section area of and is stretched by , then what is the stress?
Choices
Choice (5)  Response  

a. 


b. 


c. 


d. 


e.  All of the above 
