Question
Asked Nov 23, 2019
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A particular sample of radiation has an energy content of 1.09x10^-3 J of energy. Calculate the number of moles of photons in this sample when the wavelegth of the light is 640nm.

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Expert Answer

Step 1

Energy and number of moles of photons are related as,

Nhc
E =
Where
E-energy
N-Avogadro's number (6.02 x 1035)
h-Planck's constant (6.626 x 10* m2kg /s)
C-vel ocity of light (3x103 m/s)
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Nhc E = Where E-energy N-Avogadro's number (6.02 x 1035) h-Planck's constant (6.626 x 10* m2kg /s) C-vel ocity of light (3x103 m/s)

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Step 2

The given vales are substitute in above equatio...

EA
N=
hc
1.09x103 Jx6.40x10
6.6x103Jsx3x10 m/s
6.98x1010
1.98x105
=3.5x105 mole
help_outline

Image Transcriptionclose

EA N= hc 1.09x103 Jx6.40x10 6.6x103Jsx3x10 m/s 6.98x1010 1.98x105 =3.5x105 mole

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