+0  
 
0
158
3
avatar+32 

Enter an equation for the function. Give your answer in the form 

a(b^n).

 In the event that 

a = 1,

 give your answer in the form 

bn.


 
A laser beam with an output of 6 milliwatts is directed into a series of mirrors. The laser beam loses 2% of its power every time it reflects off of a mirror. The power p(n) is a function of the number n of reflections.

KaylaDoodlez  Jan 30, 2018
 #1
avatar+12561 
+2

One reflection mirror results in new beam of   (1) (.98)    (since .02 is lost)

    next reflectoin of THIS beam (1)(.98)  results in    (1) (.98)(.98)

         Next time    it reflects    (1) (.98)(.98)(.98)

              etc

 

so  b^n    would be beam stength:  (1) (.98)^n = (.98)^n      Where n is the number of mirrors ....

ElectricPavlov  Jan 31, 2018
 #2
avatar+86889 
+1

p(n)  =  6 (.98)n

 

 

 

cool cool cool

CPhill  Jan 31, 2018
 #3
avatar+12561 
+1

Agree with Cphil...missed the 6 mw part

 

p(n) = POWER = 6 (.98)^n  milliwatts      where n = number of reflections....

   Sorry!

ElectricPavlov  Jan 31, 2018

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