Ch. 3 - Light and the Atom Flashcards
What are the types of electromagnetic radiation from shortest wavelength to longest wavelength?
γ rays, X rays, Ultraviolet, visible spectrum, Infrared, Microwaves, FM radio waves, AM radio waves, long radio waves
What are the types of electromagnetic radiation from least energy to most energy?
long radio waves, AM radio waves, FM radio waves, Microwaves, Infrared, visible spectrum, Ultraviolet, X rays, γ rays
What is the order of the colours in the visible spectrum from shortest wavelength to longest wavelength?
Blue, green, yellow, red, purple
Who proposed that electromagnetic radiation could be treated as a wave?
James Clerk Maxwell in 1865
What is a wavelength?
The distance between successive crests of successive troughs. (λ)
What is frequency?
The number of waves passing through a point in a given period of time. (greek v)
What is amplitude?
The height of a wave (from the node).
How do you calculate the speed of a wave?
wavelength x frequency
Who proposed the photoelectric effect?
Heinrich Hertz in 1888
What is the photoelectric effect?
Electrons can be ejected from a sample by shining light on it.
Who coined the term “photons”?
Albert Einstein in 1905
What is Planck’s equation?
E = hv, where E is energy, h is Planck’s constant, and v is frequency.
What is the deBroglie equation?
λ = h/mv or λ = h/p (where p is the momentum = mv)
Who proposed that other small particles of matter can also behave as waves?
Louis de Broglie in 1924
What formula calculates the energy of hydrogen and other one-electron ions?
En = -RH(Z2/n2), where Z is the atomic number and n is the principal quantum number.
