1045_Physics ProblemsTechnical Physics

1045_Physics ProblemsTechnical Physics - 386 *P37.11...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
386 Interference of Light Waves *P37.11 Observe that the pilot must not only home in on the airport, but must be headed in the right direction when she arrives at the end of the runway. (a) λ == × × = c f 31 0 30 10 10 0 8 61 ms s m . (b) The first side maximum is at an angle given by d sin θλ = 1 af . 40 10 m m sin θ = 14 5 . tan = y L yL ° = tan tan . 2 000 14 5 516 m bg (c) The signal of 10-m wavelength in parts (a) and (b) would show maxima at 0°, 14.5°, 30.0°, 48.6°, and 90°. A signal of wavelength 11.23-m would show maxima at 0°, 16.3°, 34.2°, and 57.3°. The only value in common is 0°. If 1 and 2 were related by a ratio of small integers (a just musical consonance!) in 1 2 1 2 = n n , then the equations dn sin = 21 and sin = 12 would both be satisfied for the same nonzero angle. The pilot could come flying in with that inappropriate bearing, and run off the runway immediately after touchdown. *P37.12
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online