21 Jun EXPLAIN THIS IN TERMS OF THE REFRACTION OF ALL THE SUNSETS AND SUNRISES AROUND THE WORLD.
Please provide answers in complete sentences to the questions below Ch. 19: Exercises 12 & 36 12. You use a vice to Örmly clamp one end of a hacksaw blade. You twang the free end and it vibrates. If you do the same, but Örst place a wad of clay on the free end, how, if at all, will the frequency of vibration differ? Would it make a difference if the wad of clay were stuck to the middle? Explain. (Why could this question have been asked back in Chapter 8?) 36. Why is there a Doppler effect when the source of sound is stationary and the listener is in motion?In which direction should the listener move to hear a higher frequency? A lower frequency? Ch. 20: Exercises 16, 21 & 23 16. If a bell is ringing inside a bell jar, we can no longer hear it when the air is evacuated, but we can still see it. What differences in the properties of sound and light does this indicate? 21. Why does sound travel slower in cold air? 23. Would the refraction of sound be possible if the speed of sound were unaffected by wind, temperature, and other conditions? Defend your answer. Ch. 21: Exercises 32 32. The frequency range for a telephone is between 500 Hz and 4000 Hz. Why does a telephone not do a very good job of transmitting music? Ch. 26: Exercises 43 & 47 43. The intensity of light decreases as the inverse square of the distance from the source. Does this mean that light energy is lost? Explain. 47. When you look at the night sky, some stars are brighter than others. Can you correctly say that the brightest stars emit more light? Defend your answer Ch. 27: Exercises 10 & 16 10. The radiation curve of the Sun (Figures 27.7 and 27.8) show that the brightest light from the Sun is yellow-green. Why, then, do we see the Sun as whitish instead of yellowgreen? 16. Does color television operate by color addition or by color subtraction? Defend your answer. Ch. 28: Exercises 4 & 26 4. Fermat’s principle is of least time rather than of least distance. Would least distance apply as well for re×ection? For refraction? Why are your answers different? 26. During a lunar eclipse, the Moon is not completely dark but is usually a deep red in color. Explain this in terms of the refraction of all the sunsets and sunrises around the world. Ch. 29: Exercises 2 & 22 2. In our everyday environment, diffraction is much more evident for sound waves than for light waves. Why is this so? 22. When dishes are not properly rinsed after washing, different colors are re×ected from their surfaces. Explain. Ch. 30: Exercises 4 & 36 4. Ultraviolet light causes sunburns, whereas visible light, even of greater intensity, does not. Why is this so? 36. How do the avalanches of photons in a laser beam differ from the hordes of photons emitted by an incandescent lamp?
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