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Speed of light and distance to Sun

Speed of light and distance to Sun. If the speed of light is 300,000 km/sec, and it takes light 8 minutes to reach Earth from the sun, how far is the Earth from the sun?

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Speed of light and distance to Sun

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  1. Speed of light and distance to Sun • If the speed of light is 300,000 km/sec, and it takes light 8 minutes to reach Earth from the sun, how far is the Earth from the sun? • 1. 144 million kilometers2. 144 million meters3. 40,000 km4. 40,000 meters5. 2.4 million kilometers6. 2.4 million meters

  2. Speed of light and distance to Sun • If the speed of light is 300,000 km/sec, and it takes light 8 minutes to reach Earth from the sun, how far is the Earth from the sun? • 1. 144 million kilometers2. 144 million meters3. 40,000 km4. 40,000 meters5. 2.4 million kilometers6. 2.4 million meters

  3. Eclipses of Jupiter's moon • In class I demonstrated why an observer that did not move relative to Jupiter would find that the time they measure between an eclipse of one of Jupiter's moons is different from someone who is moving either toward or away from Jupiter. • If an observer is moving toward Jupiter, will they find that the time between eclipses is more or less than someone who is moving away from Jupiter? • More • Less

  4. Eclipses of Jupiter's moon • In class I demonstrated why an observer that did not move relative to Jupiter would find that the time they measure between an eclipse of one of Jupiter's moons is different from someone who is moving either toward or away from Jupiter. • If an observer is moving toward Jupiter, will they find that the time between eclipses is more or less than someone who is moving away from Jupiter? • More • Less

  5. Light bending • Which color light will bend more when passed through a prism?1. Green2. Razzmatazz3. Violet4. Yellow5. Lemon chiffon6. Chartreuse

  6. Light bending • Which color light will bend more when passed through a prism?1. Green2. Razzmatazz (redish) 3. Violet4. Yellow5. Lemon chiffon (yellowish) 6. Chartreuse (yellow-green)

  7. Overlapping waves In the top panel of the figure, two waves on a rope are shown to be approaching each other. At some instant in time, the waves overlap. Which of the following images best represents the state of the rope when the two waves overlap?

  8. t=1 t=2

  9. What is top + bottom? t=3 A A Amplitude of bottom wave is equal to that of top wave

  10. What is top + bottom? t=3 A A At blue, amplitude of top wave is higher than bottom (by about A/2) At red, amplitude of top wave is equal and opposite amplitude of bottom

  11. What is top + bottom? t=3 At blue, amplitude of top wave is higher than bottom (by about A/2) At red, amplitude of top wave is equal and opposite amplitude of bottom

  12. Overlapping waves In the top panel of the figure, two waves on a rope are shown to be approaching each other. At some instant in time, the waves overlap. Which of the following images best represents the state of the rope when the two waves overlap?

  13. Spectrum • There are dark lines in the absorption spectrum that represent missing light. What happened to this light that is missing in the absorption line spectrum? 1. This light was converted to radio waves.2. This light was converted to gamma rays.3. This light was converted into an atom.4. This light was absorbed by an atom in the gas and then scattered in a random direction.

  14. Spectrum • There are dark lines in the absorption spectrum that represent missing light. What happened to this light that is missing in the absorption line spectrum? 1. This light was converted to radio waves.2. This light was converted to gamma rays.3. This light was converted into an atom.4. This light was absorbed by an atom in the gas and then scattered in a random direction.

  15. Spectrum 2 • Imagine that your are looking at two different spectra of the Sun. Spectrum #1 is obtained using a telescope that is above Earth’s atmosphere (for example, on the Moon). Spectrum #2 is obtained using a telescope located on the surface of Earth. Which spectrum is Spectrum #2 and why.  Select the best answer.

  16. Spectrum 2 • Imagine that your are looking at two different spectra of the Sun. Spectrum #1 is obtained using a telescope that is above Earth’s atmosphere (for example, on the Moon). Spectrum #2 is obtained using a telescope located on the surface of Earth. Which spectrum is Spectrum #2 and why.  Select the best answer.

  17. Electromagnetic radiation energy • The equation that tells us how much energy electromagnetic radiation has is E = hc/l, where l is the wavelength. According to this formula, which of the following will have the most energy? 1. A red photon2. A green photon3. A violet photon4. A yellow photon 5. All are the same

  18. Electromagnetic radiation energy • The equation that tells us how much energy electromagnetic radiation has is E = hc/l, where l is the wavelength. According to this formula, which of the following will have the most energy? 1. A red photon2. A green photon3. A violet photon4. A yellow photon 5. All are the same

  19. Electromagnetic radiation speed • Which of the following forms of electromagnetic radiation has the highest speed in empty space?(A) A violet photon(B) A green photon(C) A red photon(D) A yellow photon (E) All are the same

  20. Electromagnetic radiation speed • Which of the following forms of electromagnetic radiation has the highest speed in empty space?(A) A violet photon(B) A green photon(C) A red photon(D) A yellow photon (E) All are the same (and equal to c) Applies to all electromagnetic waves!

  21. Photons and Electromagnetic Radiation • What is the difference between light and electromagnetic radiation?1. A light photon travels faster2. They are the same thing. What we call visible light is electromagnetic radiation with a frequency that our eyes can detect.3. A light photon travels slower4. Electromagnetic radiation can interact with electromagnets while light cannot

  22. Photons and Electromagnetic Radiation • What is the difference between light and electromagnetic radiation?1. A light photon travels faster2. They are the same thing. What we call visible light is electromagnetic radiation with a frequency that our eyes can detect.3. A light photon travels slower4. Electromagnetic radiation can interact with electromagnets while light cannot

  23. Rutherford's atom • Rutherford shot alpha particles at a thin foil and was able to show that 1. Gold foil has no neutrons2. Gold foil has no electrons3. The atom is generally very empty except for a dense area where protons and neutrons are concentrated.4. The atom is generally very uniform and when you shoot an alpha particle at it, it is very likely to hit a proton an be reflected back.

  24. Rutherford's atom • Rutherford shot alpha particles at a thin foil and was able to show that 1. Gold foil has no neutrons2. Gold foil has no electrons3. The atom is generally very empty except for a dense area where protons and neutrons are concentrated.4. The atom is generally very uniform and when you shoot an alpha particle at it, it is very likely to hit a proton an be reflected back.

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