- #1

johnq2k7

- 64

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a.) What is the photon flux density at P?

b.) What would be the photon fluence in one hour?

c.) What is the corresponding energy fluence in SI units?

work shown:

a.) 7.5 x 10^8 photons/m^2-sec-keV x (100 keV- 10 keV)= 6.75 x 10^10 photons/m^2-sec

-this answer is correct

b.) 6.75 x 10^10 photons/m^2-sec * (3600 sec/1hr)= 2.43 x 10^14 photons/m^2

-this answer is correct

c.) i need help here,

7.5 x 10^8 photons/m^2-sec-keV x (3600 sec/ 1hr) *(100-10 keV)

= 2.43 x 10^14 photons/m^2 how do i convert to J/m^2 here

like basically I have to convert photons to Joules, but how do i do this?

the correct answer is apparently 2.14 J/m^2 but i can't get the answer

please help!