Speakeasy forum

General discussion

Herschel's Infrared. Interesting.

by James Denison / April 1, 2004 2:01 AM PST

Lots of interesting links from this page too.

http://coolcosmos.ipac.caltech.edu/cosmic_classroom/ir_tutorial/discovery.html

In the year 1800, Herschel made another very important discovery. He was interested in learning how much heat passed through the different colored filters he used to observe the Sun and noticed that filters of different colors seemed to pass different levels of heat. Herschel thought that the colors themselves might contain different levels of heat, so he devised a clever experiment to investigate his hypothesis.


Herschel directed sunlight through a glass prism to create a spectrum - the "rainbow" created when light is divided into its colors - and measured the temperature of each color. He used three thermometers with blackened bulbs (to better absorb the heat) and placed one bulb in each color while the other two were placed beyond the spectrum as control samples. As he measured the temperatures of the violet, blue, green, yellow, orange and red light, he noticed that all of the colors had temperatures higher than the controls and that the temperature of the colors increased from the violet to the red part of the spectrum. After noticing this pattern, Herschel decided to measure the temperature just beyond the red portion of the spectrum in a region apparently devoid of sunlight. To his surprise, he found that this region had the highest temperature of all.

Discussion is locked
You are posting a reply to: Herschel's Infrared. Interesting.
The posting of advertisements, profanity, or personal attacks is prohibited. Please refer to our CNET Forums policies for details. All submitted content is subject to our Terms of Use.
Track this discussion and email me when there are updates

If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.

You are reporting the following post: Herschel's Infrared. Interesting.
This post has been flagged and will be reviewed by our staff. Thank you for helping us maintain CNET's great community.
Sorry, there was a problem flagging this post. Please try again now or at a later time.
If you believe this post is offensive or violates the CNET Forums' Usage policies, you can report it below (this will not automatically remove the post). Once reported, our moderators will be notified and the post will be reviewed.
Popular Forums
icon
Computer Help 51,912 discussions
icon
Computer Newbies 10,498 discussions
icon
Laptops 20,411 discussions
icon
Security 30,882 discussions
icon
TVs & Home Theaters 21,253 discussions
icon
Windows 10 1,672 discussions
icon
Phones 16,494 discussions
icon
Windows 7 7,855 discussions
icon
Networking & Wireless 15,504 discussions

REVIEW

Meet the drop-resistant Moto Z2 Force

The Moto Z2 Force is really thin, with a fast processor and great battery life. It can survive drops without shattering.