EMS (ELECTRO MAGNETIC SPECTRUM). WHAT TYPES OF RADIATION (WAVES) ARE NOT VISIBLE? CAN YOU RANK THEM IN ORDER OF ENERGY? (WHICH ARE MORE ENERGETIC)?

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Presentation transcript:

EMS (ELECTRO MAGNETIC SPECTRUM)

WHAT TYPES OF RADIATION (WAVES) ARE NOT VISIBLE? CAN YOU RANK THEM IN ORDER OF ENERGY? (WHICH ARE MORE ENERGETIC)?

WAVE CHARACTERISTICS (PHYSICS)

RELATIONSHIP BETWEEN FREQUENCY AND WAVELENGTH?

SPEED OF LIGHT CONSTANT Speed of Light = C = x10^8 meters/sec

CALCULATE THE WAVELENGTH OF YELLOW LIGHT EMITTED FROM A SODIUM STREET LAMP IF THE FREQUENCY OF THE RADIATION = 5.10X10^14 HERTZ

APPLICATION OF SPEED OF LIGHT

ATOMIC SPECTRA Add energy = electrons get excited and ‘jump’ up energy level (not visible) Lose energy = electrons release energy in form of light (visible) back to GROUND STATE

VISUALS

HOW CAN WE SEE THESE SPECTRAS?

SPECTROSCOPE

CONTINUOUS VS LINE SPECTRUM CONTINIOUS LINE (all colors present, cloudy) (specific lines only)

EXCITED – ‘JUMP’ GROUNDED – “LIGHT”

THAT RELEASE OF ENERGY BACK TO GROUND STATE Photon Particle = E

PLANCKS CONSTANT Energy of Photon (E) = Plancks Constant (h) x Frequency (v) E = (6.626 x 10^-34) x (V)

WHEN WOULD I EVER USE THIS

APPLY ALL THE EQUATIONS TO WHAT YOU WILL BE DOING IN THE LAB 1.What is the wavelength in Angstroms of the green band? (number it is lined up with) 2.Convert the wavelength to meters 3.Convert #2 to nanometers 4.Calculate the frequency of the green beam

Fluorescent BulbIncandescent Bulb