I Photon Absorption

  • Thread starter gmalcolm77
  • Start date
28
2
Summary
MIT researchers have created a material that is 10x blacker than any other material ever recorded. The foil captures at least 99.995% of incoming light.
Summary: MIT researchers have created a material that is 10x blacker than any other material ever recorded. The foil captures at least 99.995% of incoming light.

Does this mean that there is practically no EM re-radiated?
 

BvU

Science Advisor
Homework Helper
12,334
2,743
For a certain range of wavelengths: yes !
 

davenn

Science Advisor
Gold Member
8,822
6,107
The foil captures at least 99.995% of incoming light.

Does this mean that there is practically no EM re-radiated?
those statements need to be qualified.
As @BvU said, "for certain wavelengths, yes"
There's probably still lots of IR being radiated and that is still EM
All that energy being absorbed has to go somewhere
 
28
2
those statements need to be qualified.
As @BvU said, "for certain wavelengths, yes"
There's probably still lots of IR being radiated and that is still EM
All that energy being absorbed has to go somewhere
Yea, I figured so, otherwise it's energy would eventually be infinite. The MIT quote I believe is a bit misleading. Thanks.
 

berkeman

Mentor
55,718
5,803
Yea, I figured so, otherwise it's energy would eventually be infinite. The MIT quote I believe is a bit misleading. Thanks.
I'm not sure why you aren't responding to my PM requesting that you post a link to a source to help us out, but I did the Google search and here is one such link:

 
28
2
I'm not sure why you aren't responding to my PM requesting that you post a link to a source to help us out, but I did the Google search and here is one such link:
Haven't figured that out yet. Just a dumb old guy interested in science. Please forgive.
 

berkeman

Mentor
55,718
5,803
No worries. I only had asked in my private message to you that you post a link in your thread so everybody didn't have to go off searching on their own trying to find the original paper so that they could respond well. I did the search now and posted the link, so all is good. :smile:
 

sophiecentaur

Science Advisor
Gold Member
23,531
3,946
Summary: MIT researchers have created a material that is 10x blacker than any other material ever recorded. The foil captures at least 99.995% of incoming light.

Does this mean that there is practically no EM re-radiated?
It really means that practically none is reflected. But it would need to get pretty hot before significant levels of thermal wavelengths would be emitted in the visible range.
 

DrClaude

Mentor
6,971
3,144
It really means that practically none is reflected. But it would need to get pretty hot before significant levels of thermal wavelengths would be emitted in the visible range.
By Kirchhoff's law, it won't emit much in the visible range in any case.
 

Want to reply to this thread?

"Photon Absorption" You must log in or register to reply here.

Related Threads for: Photon Absorption

  • Posted
Replies
2
Views
2K
  • Posted
Replies
1
Views
2K
Replies
0
Views
962
Replies
2
Views
2K
  • Posted
Replies
1
Views
2K
  • Posted
Replies
1
Views
2K
  • Posted
Replies
5
Views
3K
  • Posted
Replies
1
Views
3K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top