Class Notes (808,703)
United States (313,202)
Chemistry (249)
CHEM 111 (69)
Lecture

# Wave nature of light, other wave properties, particle properties

4 Pages
32 Views

School
Department
Chemistry
Course
CHEM 111
Professor
Dana Johnson
Semester
Fall

Description
3 September Announcements Last day for survey (easiest homework points!) More.colostate.edu/class/ Recitation still meets next week (no lab, though) ALEKS due date for 1 Objective Tuesday 9/7 at 5 pm Makeup Toledo for people who registered late Wednesday 9/8 at 7 pm, room TBA Electromagnetic (EM) Spectrum Visible light a part of a continuum of radiation Wave nature of light Speed – all EM radiation moves at the same speed in a vacuum, namely, the speed of light. C = 3.00 x 10 m / s Wavelength (λ) – distance from one point on a wave to the corresponding point on the -10 next, units of nm, pm, or angstroms (Ǻ, 10 m) -1 Frequency (ν) – number of waves per second, units of 1 / sec (sec , or hertz) All 3 related by → c = λ x ν C = λ x ν λ and ν are inversely related Clicker question IR radiation is used by chemists to determine what type of bonds are in a molecule. A C – O bond will absorb IR radiatio8 of wavelength 9.6 μm. What is the frequency of that radiation in Hz? (c = 3.00 x 10 m /s ) A. 31.25 Hz 13 B. 3.1 x 10 Hz C. 3.2 x 10 -14Hz D. 3.20 x 10 -14Hz 13 E. 3.125 x 10 Hz Clicker solution C = λ x ν → solve for ν → ν = c / λ C = 3.00 x 10 m /s -6 -6 λ = 9.6 μm x (10 m / μm) = 9.6 x 10 m ν = 3.00 x 10 m /s / 9.6 x 10 m -6 ν = 3.125 x 10 s or Hz 13 ν = 3.1 x 10 Hz (2 sig figs) Other wave properties Amplitude – height of a crest of a wave, connected to intensity of color, not energy of the wave Refraction – when a wave passes into different media, its speed changes, which changes its angle of motion Diffraction – seen when a wave bends around the edge of an object, can result in interference Constructive interference – the waves are in phase, add up to larger amplitude Destructive
More Less

Related notes for CHEM 111

OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Join to view

OR

By registering, I agree to the Terms and Privacy Policies
Just a few more details

So we can recommend you notes for your school.