3 years ago

Which of the following shows the correct order of the body systems involved in this response?

Physics

1 answer:

dem82 [27]3 years ago

7 0

B. Circulatory, respiratory, nervous

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2 years ago

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2 years ago

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2 years ago

How many photons strike the cd surface during the playing of a cd 69 minutes in length?

Reptile [31]

Answer:

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Explanation:

First of all, it is necessary to calculate the energy produced by a semiconductor laser for 69 minutes:

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$E=0.1x10^{-3}w*4140s=0.414J$

Next, it is possible to calculate the number of photons striking the CD surface during this time:

$E=\frac{n*h*c}{l}$

$l=780x10^{-9}m$ long in CD

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$h=6.626x10^{-34} J*s$

Solve to n'

$n=\frac{E*l}{c*h}=\frac{0.414 J*780x10^{-9}m}{3x10^8m/s*6.626x10^{-34}}$

$n=1.624 x10^{18}$

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2 years ago