問題一覧
1
dsinø=+-m¥
constructive interference
2
The property by which two monochromatic light waves wavelengths maintain a constant phase relationship is an example of
coherence.
3
Many medical procedures are done with lasers because specific body tissue
absorbs different wavelength of light.
4
lasers dosent transform other forms of energy into coherent light
false
5
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
6
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
7
is the difference in the distance traveled by two beams when they are scattered in the same direction from different points
path difference
8
Which of the following changes would increase the resolution of a telescope?
observing light of greater wavelength, decreasing the aperture
9
a light source that has a single wavelength
monochromatic
10
the position of a maximum ø depends on
dsinØ =+-m¥
11
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.
12
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.
13
Fringes _______________ form because two light waves that are in phase interfere.
G and I
14
uses diffraction and interference to disperse light intro it’s component colors
diffraction grating
15
is a change in the direction of a wave when the wave encounters an obstacle an opening or an edge
diffraction
16
compact disc and DVD players use lasers to read digital data on these discs
true
17
the central bright fringe at m=0 is ça the zero order maximum, or the central maximum
true
18
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
19
sources of light for which the phrase difference is constant are said to be
coherent
20
is a device that produces coherent light at a single wavelength
laser
21
What is the function of a spectrometer?
to separate light from a source into its monochromatic components
22
lasers are used to measure distance with great precision
true
23
waves must have constant phase difference for interference to be observed
true
24
. 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.
25
Which of the following values is the minimum phase difference between two monochromatic light waves that are in phase?
0
26
Fringe _______________ is a second order maximum.
I
27
The condition for the second dark fringe in the above pattern is described by which equation?
dsinØ =3¥/2
28
sources of light for which the phase difference is not constant are said to be
incoherent
29
the resultant amplitude is less than the amplitude of the larger component wave
destructive interference
30
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
31
A laser includes all of the following except a(n)
incandescent filament.
32
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
33
Stimulated emission is the process of
producing more light waves that are coherent with an incident light wave.
34
Most of the light produced by stimulated emission
escapes out the sides of the glass tube in a laser.
35
Masers are laser like devices that operate in the ______________ region of the electromagnetic spectrum.
microwave
36
dsinØ=+-(m+1/2)¥
destructive interference
37
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
38
Characteristics of a beam of light from a laser include all of the following except
non-directional.
39
takes place only between waves with the same wavelength
interference
40
is the correlation between the phases of two or more waves
coherence
41
Instruments that have high resolution are designed to
. reduce interference.
42
the word laser is an acronym of “light amplification by stimulated emissions of radiation "
true
43
The wavelength of the emitted light from a laser is determined by which of the following?
composition of the active medium
44
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.
45
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
46
(as in Hugenś principle) in a wave front interfere with each other
wavelet’s
47
the location of interference fringes can’t be predicted
false