In: Physics
Consider the function f(x) = cos (bx2), where b = 0.0628cm−2. PLEASE SHOW ALL WORK AND EXPLAIN THOROUGHLY!
Equation Q12.8: [λx]2=-4π2f(x)d2f/dx2
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 (a)  | 
 Argue that this function has crests at x = 0, 10 cm, 14.1cm, 17.3 cm, 20 cm, 22.4 cm, and so on.  | 
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 (b)  | 
 Draw a graph of this function and show that it is like a wave whose wavelength decreases as x increases.  | 
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 (c)  | 
 Estimate this function’s local wavelength at x = 20cm by averaging the distances to adjacent crests on either side of this point.  | 
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 (d)  | 
 Compute this function’s local wavelength at x = 20cm, using equation Q12.8, and compare the result with your answer for part (c).  |