ULTRA-VIOLET RADIATION - HARMFUL EFFECTS AND BENEFITS

Average
4
Rating : 12345
Rate This Article : 1 2 3 4 5
RSS Email Print This Page Comment bookmark
Font : A-A+

Discovery of Ultraviolet and Infra Red Radiation

William Herschel (1800) and Johann W. Ritter (1801) discovered that there were regions of the light spectrum invisible to the naked human eye.

Herschel used a prism and thermometer to measure the temperature of each of the seven colors that emitted after the light passed through the prism and split into seven colors of the rainbow (violet, indigo, blue, green, yellow, orange and red). He also wanted to use a control for his experiment and hence measured the temperature beyond the visible spectrum. To his amazement he found that the region beyond the red portion of the spectrum had the highest temperature. This area of the spectrum could not be seen but felt and was called the infrared region.

Ritter a year later discovered electro- magnetic emissions in the region beyond the violet end of the visible light spectrum. In his experiment he found that the silver chloride normally darkened when exposed to visible light and darkened even more when exposed to the light beyond the 'violet'end of the spectrum; this was called the ultraviolet region.

Post a Comment

Comments should be on the topic and should not be abusive. The editorial team reserves the right to review and moderate the comments posted on the site.
Notify me when reply is posted
I agree to the terms and conditions

Health Topics A - Z

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Medindia Health Topics Search

Skin Care & Beauty

Medindia Newsletters

Subscribe to our Free Newsletters!

Terms & Conditions and Privacy Policy.

Find a Doctor

Doctor Search

Stay Connected

  • Available on the Android Market
  • Available on the App Store

Facebook