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 02-22-2014, 01:32 PM #9761 cheesefries High Five!     Join Date: Feb 2014 If the moon was made of spare ribs... would you eat it? __________________ Gibson LP Trad+, SG Standard. Fender MIA Strat & Tele. DSL50, TSL60, JVM 205h Orange 412/212 V30/G12H30 Line 6 G50>Kirk Hammet Wah>MXR EQ>Decimator>PolyTune>EVH Phase 90>DynaComp>Maxon808>Black Label Chorus.
02-22-2014, 02:33 PM   #9762
DamienEx1021
Registered User

Join Date: Apr 2013
Location: Virginia
Quote:
 Originally Posted by cheesefries If the moon was made of spare ribs... would you eat it?

Its against my religion to eat 'space rib'. You see, this 'space rib' provides us with our tides and assists in stabilizing our orbit to the solar center. If everyone said "well just one bite wouldn't hurt" then the next thing you know half the moon is gone and our solar balance is forever changed.

Now don't get me wrong, I would love to try it, but do you think you would want to stop eating 'space rib' once you had it?

__________________
“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson

 03-05-2014, 02:30 PM #9763 Ablast Registered User   Join Date: Apr 2011 anyone wanna help me with this problem? how many photons are produced in a laser pulse of 0.686J at 487nm? I have worked it out 2 times but it says I am wrong.
 03-05-2014, 03:16 PM #9764 DamienEx1021 Registered User     Join Date: Apr 2013 Location: Virginia E=hv c=wv rearrange to v=c/w E=(hc)/w E = energy of a single photon h = reduced Planck constant c = speed of light constant w = wavelength v = frequency Convert nm to m E = (2.998x10^8 m/s * 6.626x10^-34 J*s ) / 4.87x10^-7 m E = 4.079x10^-19 J/photon 0.686 J * (1 photon / 4.079x10-19 J ) = 1.682x10^18 photons Check your units, conversion, sig figs, and make sure you aren't dropping off decimals till the very end. __________________ “The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson
 03-05-2014, 03:19 PM #9765 jocke_x1 Registered User     Join Date: May 2006 I would guess you could use E_photon = h*nu -> E_tot = n*E_photon -> n = E_tot/E_photon Just be carful about units, Plancks constant ~6.6 Js nu = c/487nm -> n= 1.682*10e18 photons is that what you got?
03-05-2014, 03:24 PM   #9766
Ablast
Registered User

Join Date: Apr 2011
Quote:
 Originally Posted by DamienEx1021 E=hv c=wv rearrange to v=c/w E=(hc)/w E = energy of a single photon h = reduced Planck constant c = speed of light constant w = wavelength v = frequency Convert nm to m E = (2.998x10^8 m/s * 6.626x10^-34 J*s ) / 4.87x10^-7 m E = 4.079x10^-19 J/photon 0.686 J * (1 photon / 4.079x10-19 J ) = 1.682x10^18 photons Check your units, conversion, sig figs, and make sure you aren't dropping off decimals till the very end.

I got a very similar answer to both of you, my calculator apparently thought it was 1.682x10^19 photons

 03-05-2014, 03:29 PM #9767 Ablast Registered User   Join Date: Apr 2011 Thanks guys

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