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Chapter 36: Q69P (page 1113)
X rays of wavelength are found to undergo second order reflection at a Bragg angle offrom a lithium fluoride crystal. What is the interplanar spacing of the reflecting planes in the crystal?
The inter planar spacing of the reflecting planes in the crystal is .
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An acoustic double-slit system (of slit separation and slit width ) is driven by two loudspeakers as shown in Fig. 36-51. By use of a variable delay line, the phase of one of the speakers may be varied relative to the other speaker. Describe in detail what changes occur in the double-slit diffraction pattern at large distances as the phase difference between the speakers is varied from zero to . Take both interference and diffraction effects into account.
In a single-slit diffraction experiment, the top and bottom rays through the slit arrive at a certain point on the viewing screen with a path length difference of 4.0 wavelengths. In a phasor representation like those in Fig 36-7, how many overlapping circles does the chain of phasors make?
The wall of a large room is covered with acoustic tile in which small holes are drilled from centre to centre. How far can a person be from such a tile and still distinguish the individual holes, assuming ideal conditions, the pupil diameter of the observer鈥檚 eye to be , and the wavelength of the room light to be ?
For three experiments, Fig.36-31 gives the parameter of Eq. 36-20 versus angle in two-slit interference using light of wavelength 500 nm. The slit separations in the three experiments differ. Rank the experiments according to (a) the slit separations and (b) the total number of two slit interference maxima in the pattern, greatest first.
A source containing a mixture of hydrogen and deuterium atoms emits red light at two wavelengths whose mean is 656.3 nm and whose separation is 0.180 nm. Find the minimum number of lines needed in a diffraction grating that can resolve these lines in the first order.
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