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Unformatted text preview: increased? (a) The fringes would become brighter. (b) The central bright fringe would change position. (c) The distance between dark fringes would increase. (d) The distance between bright fringes would increase. (e) The angular separation between the dark fringes would decrease. 7. A 500 lines/mm diffraction grating is illuminated by light of wavelength 510 nm. How many diffraction orders are seen, and what is the angle of each? 8. A double slit is illuminated simultaneously with orange light of wavelength 600 nm and light of an unknown wavelength. The fourth order bright fringe of the unknown wavelength overlaps the third order bright orange fringe. What is the unknown wavelength? 9. The opening to a cave is a tall, 30-cm-wide crack. A bat that is preparing to leave the cave emits a 30 kHz ultrasonic chirp. How wide is the “sound beam” 100 m outside the cave opening? Use v sound = 340 m/s....
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- Spring '08