LIGHT REVIEW MRS. ROSE HCHEM 2015. WHAT IS THE WAVELENGTH AND FREQUENCY OF LINE 1 AND LINE 2?
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Transcript of LIGHT REVIEW MRS. ROSE HCHEM 2015. WHAT IS THE WAVELENGTH AND FREQUENCY OF LINE 1 AND LINE 2?
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L I G H T R E V I E WM R S . R OS E HC HEM 2015
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W H AT I S T H E WAV E L E N GT H A N D F R E Q U E N CY O F L I N E 1 A N D L I N E 2?
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E N E R G Y O F W A V E S – I T T A K E S M O R E E N E R G Y T O T R A V E L A T A H I G H E R F R E Q U E N C Y …
Low frequency
High frequency, short wavelength
Amplitude
Amplitude
Low frequency,long wavelength
short wavelength l
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What kind of relationship exists between wavelength and frequency?
A) LogarithmicB) QuadraticC) DirectD) Inverse
Rueben’s TubeTones
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E L E C T R OMAG NE T IC RA D I AT I ON
Vision
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V I S I B L E PA RT O F E M S P E C T R U M
PRISM
Slit
Ray of
White Light
Waves 1/33,000” long
Waves 1/70,000” long
RedOrangeYellowGreenBlue
IndigoViolet
400 nm – 700 nm
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V O C A B U L A RY O F A WAV E
Zumdahl, Zumdahl, DeCoste, World of Chemistry 2002, page 324
l
A
?
c = speed of light = 2.998 x 10 8 m/s
(really fast, true for every kind of light!)
Wavelength (m or nm)
FREQUENCY (HZ OR S-1)
Amplitude (m)
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F R E Q U E N C Y
O’Connor, Davis, MacNab, McClellan, CHEMISTRY Experiments and Principles 1982, page 166
1 second
Frequency
4 cycles/second = 4 hertz
12 cycles/second = 12 hertz
36 cycles/second = 36 hertz
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WAV E S• Wavelength (l) - length of one complete
wave. Common units: m or nm
• Frequency (𝜈) - # of waves that pass a point during a certain time period (usually per second)
Common Units: hertz (Hz) = 1/s = s-1
• Amplitude (A) - distance from the origin to the trough or crest (height of one wave)
Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem
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W H I C H C O LO R O F V I S I BL E L I G H T H A S T H E LO NG E S T WAV E L E N GT H ?
A) YELLOW
B) BLUE
C) RED
D) VIOLET
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WH I CH TYPE OF L I GH T H AS M OR E E NE R GY TH AN V I S I BL E L I GH T BU T L E S S E NE R GY TH AN G AMM A RAYS ?
A) RadiowavesB) MicrowavesC) InfraredD) UV rays
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REVIEW1) Which color of light (Red or Violet) does wave B represent?
2) Which wave has the lowest frequency?
3) Which wave has the most energy?
4) Which wave has the shortest wavelength?
5) Which wave travels the fastest?
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WHAT HAPPENS WHEN RED, GREEN AND V IOLET L IGHT ARE D IRECTED AT A GLOW- IN-THE-DARK SURFACE?
F R I S BEE D EM O! !
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Vs.
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Vs.
REVIEW
Quantized Continuous
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A BSO R P T I O N A N D E M I SS I O N
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absorption and emission