We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published byDonald Fowler
Modified over 4 years ago
Reflectance Spectroscopy Lab
Different colors correspond to different wavelengths of visible light 665 nm 630 nm 600 nm 550 nm 470 nm 425 nm 400 nm
Today’s Lab If we shine light on an object, some light is absorbed and some is reflected Which wavelengths/colors are absorbed versus reflected?
Incoming white light (all colors )
White paper Incoming white light (all colors )
White paper White paper reflects all wavelengths Incoming white light (all colors )
Black Paper Incoming white light (all colors ) Absorbs all wavelengths
Green Paper Reflects green light Incoming white light (all colors ) Absorbs other colors
Objects appear to be different colors because of the light they reflect
Reflected light versus emitted light
Spectrum: a plot that shows how reflected light from an object varies with wavelength
Different objects have unique spectra
Reflectance Spectrometer Shines a single wavelength of light on an object and measures intensity of reflected light
Reflectance Spectrometer Has 2 infrared channels
Infrared light has longer wavelength than red light Can think of infrared energy as the heat an object emits Humans emit infrared energy Planets emit infrared energy
Atmospheric Optics - I. Recap Condensation above the Earth surface produces clouds. Clouds are divided into 4 main groups: ♦ High ♦ Middle ♦ Low ♦ Clouds.
Astronomical Spectroscopy. The Electromagnetic Spectrum.
Life always offers you a second chance. It’s called tomorrow.
Emission Spectra and Flame Tests. The Big Questions What is light? How is light emitted? What do electrons have to do with light? What are emission spectra?
Electron Arrangement and EMR – Virtual Lab Line Spectra
Thermal radiation Any object that is hot gives off light known as Thermal Radiation. The hotter an object is, the more light it emits. As the temperature.
Colors of M & Ms and Skittles Dr. Frank Walmsley Trinity University San Antonio, TX
Advanced Higher Chemistry Unit 1 Spectroscopy. Spectroscopy Spectroscopy is used to give information regarding the structure of atoms or molecules.
Objective: I will relate the electromagnetic spectrum to wavelengths of light energy. 9/30/14.
Light to Cells Study Guide 1.Refer to the back of p. 14 in the binder. 2.Refraction of light causes the pencil to appear bent. When light travels through.
Emission Spectroscopy Electrons jump from higher levels to lower ones.
Slide 1 © 2004 By Default! A Free sample background from By: Brittany D. Alexander.
Get your boards ready…. Name one way you can distinguish one electromagnetic wave from another. Possible answers: Frequency, wavelength, energy produced.
Electromagnetic Radiation (NB Pgs 7-9 odd) Picture pg 8.
The visible waves in the electromagnetic spectrum.
Waves How do we see color?
© 2010 Pearson Education, Inc. Range of Visible Light Our eyes can see from 400 (blue/purple) to 700 (red) nm. Nm = nanometers = meters Our eyes.
Light and Color light has both wave and particle characteristics – = wavelength; = frequency –c = speed of light = = 3.00 x 10 8 m/s –visible: ~400 nm.
Visible Spectroscopy Electromagnetic Radiation: Light & Color.
© 2020 SlidePlayer.com Inc. All rights reserved.