CH110-120 Chapter 4 Lecture Notes

CH110-120 Chapter 4 Lecture Notes - Chapter 4 Atoms and...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 4 – Atoms and Light 4.1 Characteristics of Atoms 4.2 Characteristics of Light 4.3 Absorption and Emission Spectra 4.4 Properties of Electrons 4.5 Quantization and Quantum Numbers 4.6 Shapes of Atomic Orbitals 4.7 Sunlight and the Earth
Background image of page 1

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

View Full DocumentRight Arrow Icon
4.1 Characteristics of Atoms Atoms: possess mass contain positive nuclei contain electrons occupy volume attract one another combine to form molecules
Background image of page 2
Example 4-1 The density of lithium, the lightest metal, is 0.534 g/cm 3 . Estimate the volume occupied by a single atom in solid lithium. Suggested Problems: Section Exercises: 4.1.1-4.1.2 End of Chapter Exercises: 4.1
Background image of page 3

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

View Full DocumentRight Arrow Icon
7.2 Characteristics of Light The best tool for studying the structure of atoms is electromagnetic radiation . What we call light , is just one form of electromagnetic radiation. Wavelength ( λ ) - the distance between two successive crests (units: meters or nanometers) Frequency ( ν ) - the number of waves passing a certain point over a unit of time (units: s -1 = Hz) Amplitude: height of the wave measured from the axis of propagation, a measure of intensity
Background image of page 4
c = λν Where c is the speed of light c = 2.99792458 x 10 8 m/s
Background image of page 5

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

View Full DocumentRight Arrow Icon
Example 4-2 The FM radio station transmits its signal at 88.1 MHz. What is the wavelength of the radio signals? Suggested Problems: End of Chapter Exercises 4.7, 4.9
Background image of page 6
Electromagnetic Radiation
Background image of page 7

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

View Full DocumentRight Arrow Icon
Amplitude and Intensity A bright light is more intense and has greater amplitude than a dim light. The two waves shown here have the same wavelength, but different amplitudes. The amplitude is represented by the height of the wave at its crest.
Background image of page 8
The Photoelectric Effect How is it that your car heats up in the summer? There must be energy associated with the sunlight. Light is wave-like AND has energy .* The energy is dependent on the frequency and intensity of the light .
Background image of page 9

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

View Full DocumentRight Arrow Icon
The Photoelectric Effect Shining light on a metal can lead to electrons being ejected from the metal. In the setup above, the electrons are detected because a current is induced
Background image of page 10
The Photoelectric Effect Several phenomena can be observed: Below a certain frequency, no electrons were observed, no matter what the intensity. The energy of the ejected electrons increased linearly with the frequency of light (E ν ) The number of emitted electrons increased with light intensity. All metals show the same pattern, but each metal has a different threshold frequency.
Background image of page 11

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

View Full DocumentRight Arrow Icon
Several phenomena can be observed: Below a certain frequency, no electrons were observed, no matter what the intensity. The energy of the ejected electrons increased linearly with the frequency of light (E ν ) The number of emitted electrons increased with light intensity. All metals show the same pattern, but each metal has a different
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 51

CH110-120 Chapter 4 Lecture Notes - Chapter 4 Atoms and...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online