問題一覧
1
takes place only between waves with the same wavelength
interference
2
a light source that has a single wavelength
monochromatic
3
components waves combine to form a resultant wave with the same wavelength but with an amplitude that is greater than the either of the individual component waves
constructive interference
4
the resultant amplitude is less than the amplitude of the larger component wave
destructive interference
5
waves must have constant phase difference for interference to be observed
true
6
is the correlation between the phases of two or more waves
coherence
7
sources of light for which the phrase difference is constant are said to be
coherent
8
sources of light for which the phase difference is not constant are said to be
incoherent
9
if monochromatic is used the light from the two slits producers a series of bright and dark parellel bands, or ——on a viewing screen.
fringes
10
the location of interference fringes can’t be predicted
false
11
is the difference in the distance traveled by two beams when they are scattered in the same direction from different points
path difference
12
the central bright fringe at m=0 is ça the zero order maximum, or the central maximum
true
13
dsinø=+-m¥
constructive interference
14
dsinØ=+-(m+1/2)¥
destructive interference
15
is a change in the direction of a wave when the wave encounters an obstacle an opening or an edge
diffraction
16
(as in Hugenś principle) in a wave front interfere with each other
wavelet’s
17
uses diffraction and interference to disperse light intro it’s component colors
diffraction grating
18
the position of a maximum ø depends on
dsinØ =+-m¥
19
is a device that produces coherent light at a single wavelength
laser
20
the word laser is an acronym of “light amplification by stimulated emissions of radiation "
true
21
lasers dosent transform other forms of energy into coherent light
false
22
lasers are used to measure distance with great precision
true
23
compact disc and DVD players use lasers to read digital data on these discs
true
24
The property by which two monochromatic light waves wavelengths maintain a constant phase relationship is an example of
coherence.
25
If two monochromatic light waves undergo destructive interference, the amplitude of the resultant wave is
. less than the amplitude of either of the component waves.
26
Which of the following values is the minimum phase difference between two monochromatic light waves that are in phase?
0
27
Fringes _______________ form because two light waves that are in phase interfere.
G and I
28
Fringe _______________ is a second order maximum.
I
29
The condition for the second dark fringe in the above pattern is described by which equation?
dsinØ =3¥/2
30
Among the changes that occur, which of the following would occur to the pattern shown in the figure if light of smaller wavelength were used
. G would be displaced to the right.
31
A bright fringe appears because of which of the following conditions of two interfering monochromatic light waves? I. A crest of one wave overlaps a crest of another wave. II. A crest of one wave overlaps a trough of another wave. III. A trough of one wave overlaps a crest of another wave.
I only
32
Diffraction of waves occurs when a wave encounters which of the following? I. obstacle II. opening III. sharp edge IV. another wave of equal wavelength
I, II, and III
33
. Which of the following assumptions explains the diffraction of light waves by a single slit?
Points in a wave front act as point sources of Huygens wavelets.
34
Which of the following contribute to the constructive interference pattern seen from a compact disc? I. direction of incoming light II. orientation of disc III. wavelength of light
I, II, and III
35
In an experiment, a variable width slit is illuminated by monochromatic light. As the slit width is narrowed to the same order of magnitude as the wavelength of the light, which of the following will be observed? I. The central maximum will become brighter. II. The central maximum will change color. III. The secondary maxima will disappear.
I only
36
Which is true about the angle at which a third order maximum is observed if a transmission grating that has a greater number of lines per unit length is used?
The angle will increase.
37
What is the function of a spectrometer?
to separate light from a source into its monochromatic components
38
Which of the following changes would increase the resolution of a telescope?
observing light of greater wavelength, decreasing the aperture
39
Instruments that have high resolution are designed to
. reduce interference.
40
Stimulated emission is the process of
producing more light waves that are coherent with an incident light wave.
41
A laser includes all of the following except a(n)
incandescent filament.
42
Characteristics of a beam of light from a laser include all of the following except
non-directional.
43
The wavelength of the emitted light from a laser is determined by which of the following?
composition of the active medium
44
The intensity of a He-Ne laser is listed as 0.6 W/m2. Intensity is a measure of which of the following quantities? I. energy per area per time II. power per area III. work per time
I and II
45
Most of the light produced by stimulated emission
escapes out the sides of the glass tube in a laser.
46
Masers are laser like devices that operate in the ______________ region of the electromagnetic spectrum.
microwave
47
Many medical procedures are done with lasers because specific body tissue
absorbs different wavelength of light.