Light. I. What is Light? A. Isaac Newton White light is composed of _____________.

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Presentation transcript:

Light

I. What is Light? A. Isaac Newton White light is composed of _____________

Light I. What is Light? A. Isaac Newton many colors White light is composed of __many colors__

Light I. What is Light? A. Isaac Newton many colors White light is composed of __many colors__ spectrum

Light I. What is Light? A. Isaac Newton many colors White light is composed of __many colors__ spectrum ROY G. BIV

Light I. What is Light? A. Isaac Newton many colors White light is composed of __many colors__ spectrum ROY G. BIV refraction – bending of light

Light I. What is Light? A. Isaac Newton many colors White light is composed of __many colors__ spectrum ROY G. BIV refraction – bending of light dispersion – breaking white light into colors

B. Fredrick William Herschel Light exists that is not __________ to our __________. C. Light Moves at the Speed of Light! c = 3.0 x 10 5 km/s = ________________

B. Fredrick William Herschel Light exists that is not __________ to our __________. C. Light Moves at the Speed of Light! c = 3.0 x 10 5 km/s = ________________ Discovered Uranus in 1781

B. Fredrick William Herschel visible eyes Light exists that is not __visible__ to our ___ eyes ___. C. Light Moves at the Speed of Light! c = 3.0 x 10 5 km/s = ________________ Discovered Uranus in 1781

B. Fredrick William Herschel visible eyes Light exists that is not __visible__ to our ___ eyes ___. C. Light Moves at the Speed of Light! c = 3.0 x 10 5 km/s = ________________ infrared (IR) heat

B. Fredrick William Herschel visible eyes Light exists that is not __visible__ to our ___ eyes ___. C. Light Moves at the Speed of Light! 300,000 km/s c = 3.0 x 10 5 km/s = ___300,000 km/s __ infrared (IR) heat

B. Fredrick William Herschel visible eyes Light exists that is not __visible__ to our ___ eyes ___. C. Light Moves at the Speed of Light! 300,000 km/s c = 3.0 x 10 5 km/s = ___300,000 km/s __ infrared (IR) heat Latin: celeritas

B. Fredrick William Herschel visible eyes Light exists that is not __visible__ to our ___ eyes ___. C. Light Moves at the Speed of Light! 300,000 km/s c = 3.0 x 10 5 km/s = ___300,000 km/s __ infrared (IR) heat Latin: celeritas Light does not travel with infinite speed. Light from far away takes time to reach us.

D. Light is a Wave The speed of any wave is equal to the _______________ times the _____________. Wavelength has units of ___ _____ ___. Frequency has units of _____________ or ____________. i.e. In general, v = f. For light, c = f. Example: “Vermont’s Hit Radio Station” 95 Triple X 95.5 MHz

D. Light is a Wave (electromagnetic radiation) The speed of any wave is equal to the _______________ times the _____________. Wavelength has units of ___ _____ ___. Frequency has units of _____________ or ____________. i.e. In general, v = f. For light, c = f. Example: “Vermont’s Hit Radio Station” 95 Triple X 95.5 MHz

D. Light is a Wave (electromagnetic radiation) The speed of any wave is equal to the _______________ times the _____________. Wavelength has units of ___ _____ ___. Frequency has units of _____________ or ____________. i.e. In general, v = f. For light, c = f. Example: “Vermont’s Hit Radio Station” 95 Triple X 95.5 MHz

D. Light is a Wave (electromagnetic radiation) wavelength frequency meters cycles per second Hertz The speed of any wave is equal to the ___wavelength___ times the ___frequency___. Wavelength has units of ___ meters ___. Frequency has units of cycles per second or ___ Hertz ___. i.e. In general, v = f. For light, c = f. Example: “Vermont’s Hit Radio Station” 95 Triple X 95.5 MHz

D. Light is a Wave (electromagnetic radiation) wavelength frequency meters cycles per second Hertz The speed of any wave is equal to the ___wavelength___ times the ___frequency___. Wavelength has units of ___ meters ___. Frequency has units of cycles per second or ___ Hertz ___. i.e. In general, v = f. For light, c = f. Example: “Vermont’s Hit Radio Station” 95 Triple X 95.5 MHz

D. Light is a Wave (electromagnetic radiation) wavelength frequency meters cycles per second Hertz The speed of any wave is equal to the ___wavelength___ times the ___frequency___. Wavelength has units of ___ meters ___. Frequency has units of cycles per second or ___ Hertz ___. i.e. In general, v = f. For light, c = f. Example: “Vermont’s Hit Radio Station” 95 Triple X 95.5 MHz

E. Light is a Particle The energy of light is proportional to its ______________. The energy of light is inversely proportional to its ____________.

E. Light is a Particle frequency The energy of light is proportional to its ___frequency___. wavelength The energy of light is inversely proportional to its __wavelength__. photon

E. Light is a Particle frequency The energy of light is proportional to its ___frequency___. wavelength The energy of light is inversely proportional to its __wavelength__. photon

E. Light is a Particle frequency The energy of light is proportional to its ___frequency___. wavelength The energy of light is inversely proportional to its __wavelength__. photon 700 nm 400 nm

E. Light is a Particle frequency The energy of light is proportional to its ___frequency___. wavelength The energy of light is inversely proportional to its __wavelength__. photon 700 nm 400 nm Wavelengthlongestshortest

E. Light is a Particle frequency The energy of light is proportional to its ___frequency___. wavelength The energy of light is inversely proportional to its __wavelength__. photon 700 nm 400 nm Frequencylowesthighest Wavelengthlongestshortest

E. Light is a Particle frequency The energy of light is proportional to its ___frequency___. wavelength The energy of light is inversely proportional to its __wavelength__. photon 700 nm 400 nm Energylowesthighest Frequencylowesthighest Wavelengthlongestshortest

II. How is Light Generated? A. Electron Transitions in Atoms An atom will emit light when one of its electrons moves from a ____________ energy level to a ___________ energy level. An atom will absorb light when one of its electrons moves from a ____________ energy level to a ___________ energy level. The wavelength of light emitted or absorbed with be = hc/E where E is the energy difference between the two electron levels.

II. How is Light Generated? A. Electron Transitions in Atoms emit higherlower An atom will emit light when one of its electrons moves from a ____higher___ energy level to a ___lower____ energy level. An atom will absorb light when one of its electrons moves from a ____________ energy level to a ___________ energy level. The wavelength of light emitted or absorbed with be = hc/E where E is the energy difference between the two electron levels.

II. How is Light Generated? A. Electron Transitions in Atoms higherlower An atom will emit light when one of its electrons moves from a ____higher___ energy level to a ___lower____ energy level. absorb lower higher An atom will absorb light when one of its electrons moves from a ____lower ____ energy level to a __ higher ___ energy level. The wavelength of light emitted or absorbed with be = hc/E where E is the energy difference between the two electron levels.

II. How is Light Generated? A. Electron Transitions in Atoms higherlower An atom will emit light when one of its electrons moves from a ____higher___ energy level to a ___lower____ energy level. lower higher An atom will absorb light when one of its electrons moves from a ____lower ____ energy level to a __ higher ___ energy level. wavelength = hc/E The wavelength of light emitted or absorbed with be = hc/E where E is the energy difference between the two electron levels.

B. Accelerated Charged Particles (Electrons or Ions) Electric forces will cause charged particles to accelerate in a ___________________. Magnetic forces will cause charged particles to acceleration in a __________________. Both of these motions will cause charged particles to emit light.

B. Accelerated Charged Particles (Electrons or Ions) Electric forces straight line Electric forces will cause charged particles to accelerate in a _____straight line_____. Magnetic forces will cause charged particles to acceleration in a __________________. Both of these motions will cause charged particles to emit light.

B. Accelerated Charged Particles (Electrons or Ions) straight line Electric forces will cause charged particles to accelerate in a _____straight line_____. Magnetic forces curved path Magnetic forces will cause charged particles to acceleration in a ____curved path______. Both of these motions will cause charged particles to emit light.

B. Accelerated Charged Particles (Electrons or Ions) straight line Electric forces will cause charged particles to accelerate in a _____straight line_____. curved path Magnetic forces will cause charged particles to acceleration in a ____curved path______. Both of these motionsemit light Both of these motions will cause charged particles to emit light.