. 1a) Which of these equations tells you the location of the peaks (bright lines
ID: 1466948 • Letter: #
Question
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1a) Which of these equations tells you the location of the peaks (bright lines) in the diffraction pattern?
A) 17.16
B) 17.20
C) 17.18
D) There is no equation given for the locations of the bright lines
E) 17.19
F) 17.17
1b) If you double the wavelength, what happens to the separation of the diffraction pattern? If you double the slit width, what happens to the separation of the diffraction pattern?
A) Double : halve separation; double slit width: no change in separation
B) Double : double separation; double slit width: no change in separation
C) Double : double separation; double slit width: double separation
D) Double : halve separation; double slit width: double separation
E) Double : halve separation; double slit width: halve separation
F) Double : double separation; double slit width: halve separation
1c)Rayleigh's criterion says that two objects are just barely resolved when
A) their diffraction patterns are completely separated
B) the objects have no diffraction patterns
C) the diffraction patterns are partially separated
D) their diffraction patterns have completely overlapped
1d)The smallest detail observable is of order:
A) the wavelength of light used to observe it
B) the focal length of the lens used
C) the frequency of light used to observe it
D) the diameter of the lens (or aperture) used
Explanation / Answer
seperation of the diffraction pattern = order * wavelenrth * distance of screen / slit wifth
so,
wavelength is directly proportional to seperation of the differaction pattern so,
Double ?: double separation
slit width is inversely proportional to seperation of the differaction pattern so,
double slit width: halve separation
Rayleigh's criterion says that two objects are just barely resolved when the diffraction patterns are partially separated
The smallest detail observable is of order the frequency of light used to observe it
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