At what wavelength does a 100mW laser deliver 3.5 x 10^17 photonsin one second?
ID: 1676432 • Letter: A
Question
At what wavelength does a 100mW laser deliver 3.5 x 10^17 photonsin one second?c = lambda(L) * f ===> L = cf ==> L =hc / E(energy)
h = 6.626x10^-34 (Plancks) c = 3 x 10^8 E = Time * Power?
I think the answer is found by plugging the numbers into theformula L = hc/E, but I'm not sure how to calculate the energyusing the given information, any help would be appreciated.
c = lambda(L) * f ===> L = cf ==> L =hc / E(energy)
h = 6.626x10^-34 (Plancks) c = 3 x 10^8 E = Time * Power?
I think the answer is found by plugging the numbers into theformula L = hc/E, but I'm not sure how to calculate the energyusing the given information, any help would be appreciated.
Explanation / Answer
Power P = 100 mW = 0.1 W
No.of photons per second n = 3.5 * 10 ^ 17
We know P = nhc / lamda
From this lamda = nhc / P
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