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46. When you look at a distant galaxy through a telescope, are you looking backward in time? 48. What is the fundamental source of electromagnetic
- 46. When you look at a distant galaxy through a telescope, are you looking backward in time?
- 48. What is the fundamental source of electromagnetic radiation?
- 51. Explain the principal difference between a gamma ray and an infrared ray? Defend your answer.
- 56. Your friend says that any radio wave travels appreciably faster than any sound wave. Do you agree or disagree, and why?
- 57. Are the wavelengths of radio and television signals longer or shorter than waves detectable by the human eye?
- 58. Suppose a light wave and a sound wave have the same frequency. Which has the longer wavelength? How do you know this?
- 68. Sunlight falls both on a pair of reading glasses and dark sunglasses. Which pair of glasses would you expect to become warmer? Defend your answer.
- 79. Knowing that interplanetary space consists of a vacuum, discuss your evidence that electromagnetic waves can travel through a vacuum.
- 81. Can you see radio waves? Can you hear radio waves? Discuss this with people who still confuse sound and radio waves.
- 87. Lunar eclipses are always eclipses of a full Moon. That is, the Moon is always seen full just before and after Earth's shadow passes over it. Why? Why can we never have a lunar eclipse when the Moon is in its crescent or half-moon phase?
- 36. Why do color scientists not list black and white as colors of light?
- 40. What color does red cloth appear to be when illuminated by sunlight? By light from a red neon sign? By cyan light?
- 43. How could you use the spotlights in a theater to change the performers' clothes suddenly from yellow to black?
- 48. In which of these cases will a ripe banana appear blackwhen illuminated with red, yellow, green, or blue light? Defend your answer.
- 54. our friend says that red and cyan light produce white light because cyan is green + blue, and so red + green + blue = white. Do you agree or disagree, and why?
- 61. Comment on the statement "Oh, that beautiful red sunset is just the leftover colors that weren't scattered on their way through the atmosphere."
- 73. Why will the leaves of a red rose be warmed more than the petals when illuminated with red light? Discuss how this relates to people in the hot desert wearing white clothes.
- 75. The radiation curve of the Sun indicates that the brightest sunlight is yellow-green. Why then do we see the Sun as white instead of yellow-green?27.5-33 Full Alternative Text
- 79. Why does the color black apply to pigments, but not to light?
- 83. Why is the sky a darker blue when you are at high altitudes? (Hint: What color is the "sky" on the Moon?)
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