# Lecture2 - Chem 1A Lecture 2: Matter The dual nature of...

This preview shows pages 1–9. Sign up to view the full content.

Matter Chem 1A Lecture 2:

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
The dual nature of light Light can behave as a wave, or as a stream of particles.
The dual nature of matter In our experience, matter seems to be composed of particles. plastic balls SARS virus Si surface lab of Prof. J. Collins, U. of AZ lab of Prof. W. Ho, UCI playland, McDonald’s

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
The dual nature of matter Electrons are particles with a rest mass of m e = 9.109 x 10 -31 kg Do they also behave like waves? Looks like the pattern that a wave would make!
The dual nature of matter In 1924, Louis de Broglie proposed that matter can also have wavelike properties. m = h / " c For a photon: m = h / v For a particle with velocity v: = h mv

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Matter waves Calculate the wavelength (m) for a small metal sphere with a mass of 2.50 x 10 -4 kg and a kinetic energy of 1.30 x 10 4 J. 1. Use the kinetic energy to calculate the velocity. KE = 1 2 mv 2 v 2 = 2 KE m = 2 1.30 " 10 4 J ( ) 2.54 " 10 # 4 kg = 1.04 " 10 8 m 2 / s 2 v = 1.02 " 10 4 m / s
Matter waves Calculate the wavelength (m) for a small metal sphere with a mass of 2.50 x 10 -4 kg and a kinetic energy of 1.30 x 10 4 J. 2. Calculate the wavelength. " = h mv = 2.60 # 10 \$ 34 m = 6.626 " 10 # 34 Js 2.50 " 10 # 4 kg ( ) 1.02 " 10 4 m / s ( ) This wavelength is negligible on the scale of macroscopic objects such as this one.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Calculate the wavelength (m) for an electron with a mass of 9.11 x 10 -31 kg and a kinetic energy of 3.37 x 10 -19 J. 1. Use the kinetic energy to calculate the velocity. KE
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 02/25/2012 for the course CHEM 1A 40030 taught by Professor Borovick during the Fall '10 term at UC Irvine.

### Page1 / 35

Lecture2 - Chem 1A Lecture 2: Matter The dual nature of...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online