Download presentation

Presentation is loading. Please wait.

Published byRachel Blair Modified over 3 years ago

1
Electrons in Atoms I. Waves & Particles C. Johannesson

2
**A. Waves Wavelength () - length of one complete wave**

Frequency () - # of waves that pass a point during a certain time period hertz (Hz) = 1/s Amplitude (A) - distance from the origin to the trough or crest C. Johannesson

3
** A A A. Waves crest greater amplitude (intensity) origin trough**

greater frequency (color) C. Johannesson

4
B. EM Spectrum HIGH ENERGY LOW ENERGY C. Johannesson

5
**B. EM Spectrum HIGH ENERGY LOW ENERGY R O Y G. B I V red orange yellow**

green blue indigo violet C. Johannesson

6
**c = B. EM Spectrum c: speed of light (3.00 108 m/s)**

Frequency & wavelength are inversely proportional c = c: speed of light (3.00 108 m/s) : wavelength (m, nm, etc.) : frequency (Hz) C. Johannesson

7
**B. EM Spectrum = ? = c = 434 nm = 4.34 10-7 m**

EX: Find the frequency of a photon with a wavelength of 434 nm. GIVEN: = ? = 434 nm = 4.34 10-7 m c = 3.00 108 m/s WORK: = c = 3.00 108 m/s 4.34 10-7 m = 6.91 1014 Hz C. Johannesson

8
**C. Quantum Theory Planck (1900)**

Observed - emission of light from hot objects Concluded - energy is emitted in small, specific amounts (quanta) Quantum - minimum amount of energy change C. Johannesson

9
**C. Quantum Theory vs. Planck (1900) Classical Theory Quantum Theory**

C. Johannesson

10
**C. Quantum Theory Einstein (1905) Observed - photoelectric effect**

C. Johannesson

11
**“wave-particle duality”**

C. Quantum Theory Einstein (1905) Concluded - light has properties of both waves and particles “wave-particle duality” Photon - particle of light that carries a quantum of energy C. Johannesson

12
C. Quantum Theory The energy of a photon is proportional to its frequency. E = h E: energy (J, joules) h: Planck’s constant ( J·s) : frequency (Hz) C. Johannesson

13
**C. Quantum Theory E = ? E = h = 4.57 1014 Hz**

EX: Find the energy of a red photon with a frequency of 4.57 1014 Hz. GIVEN: E = ? = 4.57 1014 Hz h = J·s WORK: E = h E = ( J·s) (4.57 1014 Hz) E = 3.03 J C. Johannesson

Similar presentations

OK

A. Waves Wavelength ( ) - length of one complete wave Frequency ( ) - # of waves that pass a point during a certain time period hertz (Hz) = 1/s

A. Waves Wavelength ( ) - length of one complete wave Frequency ( ) - # of waves that pass a point during a certain time period hertz (Hz) = 1/s

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on latest technology free download Ppt on circuit breaker switching and arc modeling Ppt on cost accounting standard Ppt on depreciation of indian rupee 2013 Ppt on human resources development Ppt on water pollution and conservation Ppt on networking related topics about work Ppt on zener diode symbol Ppt on advanced power electronics Ppt on surface area and volume of sphere and hemisphere