Download New Atomic Model and Properties of Light

Chemistry ‘S’ – Chapter 4
I Development of a New Atomic Model
The Rutherford model of the atom was an improvement over previous models.
However, the model could not answer the question _______________________________________________________?
After all, it was known that oppositely charged particles attract each other.
In the early twentieth century, a new atomic model evolved as investigations into
the _________________ and _______________ of light by matter. The studies
revealed a relationship between light and an atom’s __________.
II Properties of Light
Before 1900, scientists thought light behaved solely as a ________.
Later, it was discovered that light also had _________ - like properties.
Wave Description of Light
Visible light is a form of __________ _________, which is a form of energy that
exhibits wavelike behavior as it travels through space.
Other kinds of Electromagnetic Radiation –
X Rays, Microwaves, Radio Waves, UV, IR, etc.
Together, all forms of electromagnetic radiation form the __________
__________
All forms of electromagnetic radiation travel at a constant speed of
______________, which is known as the __________ of _________.
Wave motion is repetitive, and characterized by the measurable properties of
____________ and ____________.
Wavelength is the distance between ____________ points on ___________
waves. Wavelength is symbolized as ( ), which is the Greek symbol ________.
The unit for wavelength is a distance unit, and can be measured in a number
using many different units.
*See Figures 1 and 2 in text, Page 98*
Know these Equalities!!
1 m = 1 x 109 nm
1 cm = 1 x 108 A
nm – nanometers
A = Angstroms
Visible Light Spectrum - 400 to 700 nm
Frequency is the number of _________ that pass a given point in a specific time,
usually ____________. Frequency is symbolized as ( ), which is the Greek
symbol ___________. One unit for frequency is waves/second or hertz (Hz.),
named after Heinrich Hertz.
Mathematically, wavelength and frequency are related as follows:
Speed of Light = Wavelength x Frequency -or-
_______ = _________ x _________
Relationship Between Wavelength and Frequency