- #1
elephantorz
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[SOLVED] I'm doing something wrong...
1. A red laser with a wavelength of 650 nm and a blue laser with a wavelength of 450 nn emit laser beams with the same light power. How do their rates of photon emission compare? Answer this by computing R[tex]_{red}[/tex] / R[tex]_{blue}[/tex]
2. P = Rhf = dNhf / dt = dE[tex]_{light}[/tex] / dt
R = dN / dt
E[tex]_{light}[/tex] = Nhf, where N is the number of photons
f = c / [tex]\lambda[/tex]
h = 6.624E-32 Js
3. I have the f[tex]_{red}[/tex] = 4.62 x 10[tex]^{14}[/tex] s
and f[tex]_{blue}[/tex] = 6.67 x 10[tex]^{14}[/tex] s , it says their Powers are the same, so I go ahead and went and equaled:
P[tex]_{red}[/tex] to P[tex]_{blue}[/tex], which is:P[tex]_{red}[/tex]h[tex]_{red}[/tex]f[tex]_{red}[/tex] = P[tex]_{blue}[/tex]h[tex]_{blue}[/tex]f[tex]_{blue}[/tex]
but I am tired and can't see the relevance, because when I multiplied times h [in Js] and then I divide like explained, I get .6925, and the ANSWER is 1.44.
Help? Please?
1. A red laser with a wavelength of 650 nm and a blue laser with a wavelength of 450 nn emit laser beams with the same light power. How do their rates of photon emission compare? Answer this by computing R[tex]_{red}[/tex] / R[tex]_{blue}[/tex]
2. P = Rhf = dNhf / dt = dE[tex]_{light}[/tex] / dt
R = dN / dt
E[tex]_{light}[/tex] = Nhf, where N is the number of photons
f = c / [tex]\lambda[/tex]
h = 6.624E-32 Js
3. I have the f[tex]_{red}[/tex] = 4.62 x 10[tex]^{14}[/tex] s
and f[tex]_{blue}[/tex] = 6.67 x 10[tex]^{14}[/tex] s , it says their Powers are the same, so I go ahead and went and equaled:
P[tex]_{red}[/tex] to P[tex]_{blue}[/tex], which is:P[tex]_{red}[/tex]h[tex]_{red}[/tex]f[tex]_{red}[/tex] = P[tex]_{blue}[/tex]h[tex]_{blue}[/tex]f[tex]_{blue}[/tex]
but I am tired and can't see the relevance, because when I multiplied times h [in Js] and then I divide like explained, I get .6925, and the ANSWER is 1.44.
Help? Please?