Scientists
A German Physicist who greatly expanded our knowledge of light and its relationship to electricity
Who is Heinrich Hertz?
Atoms with the same number of protons but different numbers of neutrons
What is an isotope?
190,000 miles/second
What is the speed of light?
All atoms have an equal number of electrons and ______.
What are protons?
Na
What is sodium?
Developed the Cathode Ray Tube
Who is William Crookes?
The total number of neutrons and protons in an atom
What is the mass number?
The number of wave crests that pass a given point each second
What is frequency?
Each color you see represents a range of _____.
What are wavelengths?
Number of protons in Oxygen
What is 8?
Discovered the neutron
Who is James Chadwick?
Tells how many protons are in an atom
What is the atomic number?
Sensitive mostly to low levels of light and are not very sensitive to color
What are rods?
When wavelength is large, frequency is ____.
What is small?
Number of neutrons in Nitrogen
What is 7?
Holds world record for determining the atomic weight of oxygen to the most precision
Who is Edward Morley?
Atomic model concept developed by British Physicist J.J. Thomson
What is the plum pudding model?
The most dangerous waves on the electromagnetic spectrum
What are gamma rays?
The way we perceive color is based on the _____ of the light that hits our eyes.
What is energy?
Number of valence electrons in Helium
What is 2?
Today's model of the atom
What is the quantum mechanical model?
1/second
What is a Hz? or unit of frequency?
As a light wave's frequency increases, its _____ increases.
What is energy?
This element's atomic mass is 40
What is calcium (Ca)?