386 Interference of Light Waves*P37.11Observe that the pilot must not only home in on the airport, but must be headed in the rightdirection when she arrives at the end of the runway.(a)λ==××=−cf31030 1010 0861mssm.(b)The first side maximum is at an angle given by dsinθλ=1af.4010m msinθ==°14 5.tan=yLyL°=tantan.2 00014 5516mbg(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°, and57.3°. The only value in common is 0°. If 1and 2were related by a ratio of small integers(a just musical consonance!) in 1212=nn, then the equations dnsin=21and sin=12would both be satisfied for the same nonzero angle. The pilot could come flying in with thatinappropriate bearing, and run off the runway immediately after touchdown.*P37.12
This is the end of the preview. Sign up
access the rest of the document.