Remote Sensing C
-
- Member
- Posts: 132
- Joined: October 13th, 2016, 1:50 pm
- Division: C
- State: IL
- Has thanked: 0
- Been thanked: 0
Re: Remote Sensing C
Ah, well I never knew the constant's units. Thanks. So to confirm- This would be in the infared range.
Do I get next question? If so, I'll just let someone else do it (If that is allowed. I can't think of one rn).
Do I get next question? If so, I'll just let someone else do it (If that is allowed. I can't think of one rn).
End of freshman season. Good luck to everyone! No state for us, but nevertheless great season. Regional was out of 12 teams. (CLC)
Mat Sci-> Second at regionals
RSensing -> First at regionals
Towers-> Third at regionals.
Mat Sci-> Second at regionals
RSensing -> First at regionals
Towers-> Third at regionals.
-
- Member
- Posts: 16
- Joined: February 26th, 2017, 11:33 am
- Division: C
- Has thanked: 0
- Been thanked: 0
Re: Remote Sensing C
It would be in the infrared (LWIR). I'll ask the next question.hearthstone224 wrote:Ah, well I never knew the constant's units. Thanks. So to confirm- This would be in the infared range.
Do I get next question? If so, I'll just let someone else do it (If that is allowed. I can't think of one rn).
What temperature must a blackbody with 5.54* 10^-28 W × sr-1 × m-3 spectral radiance and 550 nm wavelength be at?
-
- Member
- Posts: 132
- Joined: October 13th, 2016, 1:50 pm
- Division: C
- State: IL
- Has thanked: 0
- Been thanked: 0
Re: Remote Sensing C
Alright. I have an idea, but I'm confused on how we would use the wavelength information.Xuax wrote:It would be in the infrared (LWIR). I'll ask the next question.hearthstone224 wrote:Ah, well I never knew the constant's units. Thanks. So to confirm- This would be in the infared range.
Do I get next question? If so, I'll just let someone else do it (If that is allowed. I can't think of one rn).
What temperature must a blackbody with 5.54* 10^-28 W × sr-1 × m-3 spectral radiance and 550 nm wavelength be at?
Stefan-Boltzmann's law states that L = A*alpha*T^4, where L is the luminosity, A is the surface area, alpha is the constant 5.670*10^-5 and then T is what we are looking for. We only lack the surface area information here.
How would we figure that out? Am I on the right track?
End of freshman season. Good luck to everyone! No state for us, but nevertheless great season. Regional was out of 12 teams. (CLC)
Mat Sci-> Second at regionals
RSensing -> First at regionals
Towers-> Third at regionals.
Mat Sci-> Second at regionals
RSensing -> First at regionals
Towers-> Third at regionals.
- Unome
- Moderator
- Posts: 4342
- Joined: January 26th, 2014, 12:48 pm
- Division: Grad
- State: GA
- Has thanked: 240 times
- Been thanked: 95 times
Re: Remote Sensing C
I suspect Xuax meant to say W x sr-1 x m-2 which is the correct unit for spectral radiance. Somehow you would have to get rid of the steradian (maybe multiply by the number of steradians per sphere?) and then use the flux form of Stefan-Boltzmann's Law: . As far as I know, the wavelength is unneeded for the problem (though I guess you can alternatively solve it using Wien's Law?)hearthstone224 wrote:Alright. I have an idea, but I'm confused on how we would use the wavelength information.Xuax wrote:It would be in the infrared (LWIR). I'll ask the next question.hearthstone224 wrote:Ah, well I never knew the constant's units. Thanks. So to confirm- This would be in the infared range.
Do I get next question? If so, I'll just let someone else do it (If that is allowed. I can't think of one rn).
What temperature must a blackbody with 5.54* 10^-28 W × sr-1 × m-3 spectral radiance and 550 nm wavelength be at?
Stefan-Boltzmann's law states that L = A*alpha*T^4, where L is the luminosity, A is the surface area, alpha is the constant 5.670*10^-5 and then T is what we are looking for. We only lack the surface area information here.
How would we figure that out? Am I on the right track?
-
- Member
- Posts: 16
- Joined: February 26th, 2017, 11:33 am
- Division: C
- Has thanked: 0
- Been thanked: 0
Re: Remote Sensing C
The question was supposed to be about the Planck function. When the function is expressed as Bλ(λ,T), the unit is W x sr-1 x m-3. That is a unit of spectral radiance. If you know the spectral radiance and the wavelength, you can find the temperature.Unome wrote:I suspect Xuax meant to say W x sr-1 x m-2 which is the correct unit for spectral radiance. Somehow you would have to get rid of the steradian (maybe multiply by the number of steradians per sphere?) and then use the flux form of Stefan-Boltzmann's Law: . As far as I know, the wavelength is unneeded for the problem (though I guess you can alternatively solve it using Wien's Law?)hearthstone224 wrote:Alright. I have an idea, but I'm confused on how we would use the wavelength information.Xuax wrote: It would be in the infrared (LWIR). I'll ask the next question.
What temperature must a blackbody with 5.54* 10^-28 W × sr-1 × m-3 spectral radiance and 550 nm wavelength be at?
Stefan-Boltzmann's law states that L = A*alpha*T^4, where L is the luminosity, A is the surface area, alpha is the constant 5.670*10^-5 and then T is what we are looking for. We only lack the surface area information here.
How would we figure that out? Am I on the right track?
Re: Remote Sensing C
Passive: Detects natural energy reflected/Emitted from an observed scenezyzzyva980 wrote:This is a great question to start with because it will be on literally every Remote Sensing test you take this year. Know the answer to this question.bhavjain wrote:Short Event Description: Participants will use remote sensing imagery, data and computational process skills to complete tasks related to climate change processes in the Earth system.
What is the difference between active and passive sensing?
Active: Detects own radiation reflected back to instrument
Re: Remote Sensing C
Is this what i would do?Xuax wrote:Use the form of Planck´s function tλ(λ,L) to find the answer.
Planck Quanta (Q) Equal to hv [variable( h ) constant equal to 6.63 x 10 to the negative 34th power] [J-s & v variable represents frequency in 1/s]
Planck Unknown Known: Frequency (v) wavelength Energy ( E )
if so how?
- whythelongface
- Exalted Member
- Posts: 326
- Joined: March 12th, 2017, 7:42 pm
- Division: Grad
- State: NJ
- Has thanked: 1 time
- Been thanked: 0
Re: Remote Sensing C
No. Planck's Function is:
So you would plug the values for B_λ and λ in and solve for T.
Sorry for being late, but I thought the thread needed reviving.
So you would plug the values for B_λ and λ in and solve for T.
Sorry for being late, but I thought the thread needed reviving.
WEST WINDSOR-PLAINSBORO HIGH SCHOOL SOUTH '18
EMORY UNIVERSITY '22
SONT 2017 5th Place Medalist [Microbe Mission]
"One little Sciolyer left all alone,
He went out and hanged himself and then there were none."
Congratulations to WW-P South/Grover for winning 2nd/1st place at NJ States!
EMORY UNIVERSITY '22
SONT 2017 5th Place Medalist [Microbe Mission]
"One little Sciolyer left all alone,
He went out and hanged himself and then there were none."
Congratulations to WW-P South/Grover for winning 2nd/1st place at NJ States!
Who is online
Users browsing this forum: No registered users and 5 guests