When solving for E= hc/λ,
does the wavelength have to be in meters or nm?
and what are the units?
2007-09-30 16:56:16 · 3 answers · asked by desigoddess217 1 in Science & Mathematics ➔ Physics
i meant... when solving for E
2007-09-30 17:00:37 · update #1
The wavelength is in meters (length of -any- thing is in meters in the MKS system ☺)
The energy of the photon is then in Joules.
Doug
2007-09-30 17:04:11 · answer #1 · answered by doug_donaghue 7 · 0⤊ 0⤋
wavelength should be in meters. the constant c which is the speed of light is a large quantity.using nm is just fine but you will need to convert units depending on what system of measure is being asked.
2007-09-30 17:41:52 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Planck's constant in SI units is 6.26 J•s
c in SI units is 2.9979.. * 10^6 m/s
so the wavelength should be in meters for the answer to come out in Joules.
2007-10-01 07:18:56 · answer #3 · answered by Dr Dave P 7 · 1⤊ 0⤋