Electromagnetic Spectrum

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Presentation transcript:

Electromagnetic Spectrum

Light Is light a wave or a particle? Light is BOTH!

Electrons Excited state: a state in which an electron has absorbed energy and moved into a higher energy level Ground state: the normal energy level an electron exists in according to its electron configuration

Energy absorbed by the electron to make it EXCITED !!! Energy lost by the electron to return to its Ground state 

Frequency *** Look at the example below what happens to the wavelength as the frequency increases? IMPORTANT: As the frequency increases, the wavelength decreases As the wavelength increases, the frequency decreases 2 cycles per second 4 cycles per second 8 cycles per second 1 second

Relationship of frequency, wavelength, and energy with light waves

Formulas Conversions 1 nm = 1 x 10-9 m c = ln 1 Angstrom = 1 x 10-10 m λ = wavelength (meters) n = frequency (Hz or sec-1) c = speed of light = 3 x 108 m/s

Practice Problem #1 What is the wavelength of light with a frequency of 6.75 x 1014 Hz?

Practice Problem #2 What is the wavelength (in nm) of EMR with a frequency of 4.95 x 1014 s¯1?

Practice Problem #3 What is the frequency of EMR having a wavelength of 555 nm? (EMR is an abbreviation for electromagnetic radiation.)

Practice Problem #4 What is the frequency of red light having a wavelength of 7000 Angstroms?

Formulas Energy(photon) = hc λ h = Planck’s constant = 6.626 x 10-34 J x s c = speed of light λ = wavelength (meters) E = hn h = Planck’s constant = 6.626 x 10-34 J x s n = frequency (Hz or sec-1)

Practice Problem #1 A sodium vapor lamp emits light photons with a wavelength of 579 nm. What is the energy of these photons?

Practice Problem #2 Find the energy for an x-ray photon with a frequency of 2.4 × 1018 Hz.

Practice Problem #3 What is the frequency of UV light that has an energy of 2.39 × 10-18 J?

Practice Problem #4 If a laser emits 2.3 x 10-17 J/photon, what is the wavelength of this light?