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anonymous
 one year ago
The retina of a human eye can detect light when radiant energy incident on it is at least 4.0 x 10^17 J. For light of 505 nm wavelength, how many photons does this energy correspond to?
anonymous
 one year ago
The retina of a human eye can detect light when radiant energy incident on it is at least 4.0 x 10^17 J. For light of 505 nm wavelength, how many photons does this energy correspond to?

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cuanchi
 one year ago
Best ResponseYou've already chosen the best response.0you have to calculate the energy of one photon E= h c /wavelength (in meters) convert the 505 nm to meters h= 6.626 x 10^(34) Js (Plank's constant) c= 3.0 x 10^8 m/s (speed of light) After you calculate the energy of one photon of 505nm you have to divide the total energy 4.0 x 10^17J by the energy of the one photon to calculate how many photons you have in that amount of energy

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I got 9.75 x 10^37 but I think I did it wrong.

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1you should post your work, but yeah, that number is not right  you should get a number of photons, not energy

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[E = \frac{ 6.626 x 10^{34}J/s x 3.0 x 10^{8}m/s }{5.05x10^{7} m }\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[\frac{ 3.9 x 10^{19} J }{ 4.0 x 10^{17}J }\]

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1good stuff. it's good up until the division. you were supposed to the divide the threshold energy, 4.0*10^17 J by the energy of the photon you can calculated.

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1you're pluggin it into the calculator incorrectly

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1the answer is 102.5641, you should try to get this number

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0What order did you put it into your calculator?

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1i use this http://web2.0calc.com/

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1havent used a normal, handheld calculator in a long time

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Think my calculator is just messing up.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Thanks for the help.

aaronq
 one year ago
Best ResponseYou've already chosen the best response.1yeah, it's tricky pluggin in negative exponents. no problem

cuanchi
 one year ago
Best ResponseYou've already chosen the best response.0@staldk3 Try to use parentheses when you enter the denominator with a power of ten, otherwise the calculator will understand that you want to multiply everything by 10^19 in place to divide by the 10^19 (4.0 x 10^17) / (3.9 x 10^19) = 1.03 x 10^2 Otherwise the calculator understand (4.0 x 10^17 / 3.9) x 10^19 = 1.03 x 10^36
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