Question

eSee page 337 17 Question (3 points) 1st attempt See Periodic Table See Hint The energy density of starlight in interstellar space is 10-15 J/m3. If the average wavelength of starlight is 500 nm, what is the corresponding density of photons per cubic meter of space? (photons/m2) photons/m3

ok this same question has been posted before but there were two answer responses, each giving a diffrent answer? and i am confused on how to convert 500 nm to m? is it 1x10^-7 or 1x10^-9?

Answer 1

Solni so Civen- energy density of starlight to interstellar space is 10-15 g/m², Average wowelength of starlight is 50oum. To find de Density of photons per cubic meter ei space. (Inm= tolm) formula Used : sooum = 500810m h. plank's coustaut (6.626818345-) c. speed of light ( 3 x 100m/s) a. wavelength (here soonm) Er Energy of photon. - 6.626 X10 34 x 3X100 E = 500x109 : E: 3.9756 x 10-19 O Density of photens & Energy density percubic meter of space Energy of photon 10-15 = 3.9755 x1679 plaw bus/m3 :: 2515 photous).m3 clensity of photos per cubic meter is 2515 photons/m² Therefore of space