Physics Final Exam Help "NEED IN 2 HOURS"

Physics  Final  Exam  

This  is  a  take  home  physics  exam.  You  test  must  be  submitted  electronically  to   eCompanion  in  the  drop  box  for  week  11.    If  you  use  a  source  for  your  answer,  you   will  need  to  cite  it.  Failure  to  cite  your  sources  will  result  in  a  0,  as  this  is  plagiarism.   Each  question  should  have  answers  that  are  3-­‐5  paragraphs  long.          

1) Explain  how  a  submarines  sonar  works  and  how  bats  here  through   echolocation.  What  makes  these  processes  the  same?  What  makes  these   processes  different?    

           

2) In  gemstones  there  are  3  processes  that  describe  the  quality  of  the  stone.   These  processes  are  referred  to  as  scintillation,  fire,  and  brilliance.  Describe   how  each  of  these  processes  works  in  terms  of   reflections/refractions/refractive  indexes.  What  would  enhance/inhibit  each   of  these  processes?  (You  might  want  to  draw  some  pictures)  

         

3) Explain  how  noise  canceling  foam  or  paneling  works.  Why  does  it  have  the   shape  that  it  does?  Does  it  matter  what  material  it  would  be  made  out  of?  

           

4) How  does  lightning  produce  thunder  and  what  cause  the  extended  rumble?   How  would  you  expect  this  to  be  different  if  you  were  at  10k  ft  above  sea   level  vs.  at  sea  level?  

       

5) Suppose  you  place  your  stereo  speakers  far  apart  and  run  past  them  from   right  to  left  or  right  to  left.  If  you  run  rapidly  enough  and  have  excellent  pitch   discrimination,  you  may  notice  that  the  music  playing  seems  to  be  out  of  tune   when  you’re  between  the  two  speakers.    

 

Physics  Final  Exam  

6) Explain  why  a  mirror  cannot  give  chromatic  aberration.        

7) During  LASIK  eye  surgery  the  shape  of  the  cornea  is  modified  by  vaporizing   some  of  its  material.  If  the  surgery  is  performed  to  correct  for   nearsightedness,  how  does  the  cornea  need  to  be  reshaped?  

    8)  Try  this  simple  experiment  on  your  own.  Take  two  opaque  cups,  place  a  coin  at   the  bottom  of  each  cup  near  the  edge,  and  fill  one  cup  with  water.  Next,  view  the   cups  at  some  angle  from  the  side  so  that  the  coin  in  water  is  just  visible.  Notice  the   coin  in  air  is  not  visible.  Explain  this  observation.