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WHAT IS ENERGY? ABILITY TO DO WORK MEASURED IN JOULES (J) WORK: TO USE A FORCE TO MOVE AN OBJECT A DISTANCE F X d.

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Presentation on theme: "WHAT IS ENERGY? ABILITY TO DO WORK MEASURED IN JOULES (J) WORK: TO USE A FORCE TO MOVE AN OBJECT A DISTANCE F X d."— Presentation transcript:

1 WHAT IS ENERGY? ABILITY TO DO WORK MEASURED IN JOULES (J) WORK: TO USE A FORCE TO MOVE AN OBJECT A DISTANCE F X d

2 WHAT ARE THE TYPES OF ENERGY? KINETIC: ENERGY DUE TO MOTION POTENTIAL: ENERGY DUE TO POSITION IDENTIFY THE FOLLOWING: CAR ROLLING DOWN A HILL STRETCHED RUBBERBAND

3 WHAT ARE THE DIFFERENT FORMS OF ENERGY? HEAT (THERMAL) ELECTROMAGNETIC CHEMICAL NUCLEAR MECHANICAL SOUND LIGHT (RADIANT)

4 THE DUALITY OF LIGHT LIGHT IS A VIBRATION (WAVE) IN ELECTRIC AND MAGNETIC FIELDS THAT CAN TRAVEL ACROSS SPACE AS A PHOTON (PACKET OF ENERGY). IT IS PART OF THE ELECTROMAGNETIC SPECTRUM. LIGHT CAN BE REFLECTED, REFRACTED AND DIFFRACTED

5 WAVE PROPERTIES WAVELENGTH ( λ ): DISTANCE BETWEEN TWO IDENTICAL POINTS ON A WAVE (METERS, m) FREQUENCY (ƒ): NUMBER OF WAVES THAT PASS A FIXED POINT IN A SECOND (HERTZ, Hz) SPEED OF LIGHT: c = ƒ λ (3.00 X 10 8 m/s)

6 PARTICLE PROPERTIES LIGHT TRAVELS IN PHOTONS (PACKETS OF ENERGY) AND CAN BE ABSORBED BY ATOMS. PHOTOELECTRIC EFFECT: EJECTION OF ELECTRONS FROM THE SURFACE OF A METAL OR OTHER MATERIAL WHEN LIGHT SHINES ON IT (EINSTEIN) E = h ƒ ENERGY = PLANCKS CONSTANT (6.63 X 10 34 J/s) X FREQUENCY

7 HOW CAN A LINE SPECTRA IDENTIFY AN ELEMENT? SPECTRA SPECTRUM SHOWING ONLY CERTAIN COLORS OR SPECIFIC WAVELENGTHS OF LIGHT. EMISSION OF LIGHT FROM AN ATOM OCCURS WHEN AN ELECTRON GOES FROM AN UPPER ENERGY LEVEL TO A LOWER ONE.

8 BOHRS ATOMIC THEORY

9 LINE SPECTRA OF VARIOUS ELEMENTSELEMENTS

10 USE OF LINE SPECTRA IN TECHNOLOGY


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