Section 19.2
Diffraction
Practice Test
1.
You are examining data from a diffraction experiment and see bands of different colors. What light was used?
a.
red
b.
diffused
c.
white
d.
blue
Hint
2.
A diffraction grating is labeled as having 11,000 lines/cm. What is the distance between the lines in the grating?
a.
9.1×10
-5
cm
b.
9.1×10
-7
cm
c.
9.6×10
-7
cm
d.
8.7×10
-5
cm
Hint
3.
What is the wavelength of light traveling through a diffraction grating on a spectrometer with 714 nm between lines and an angle of 54.0°?
a.
524 nm
b.
505 nm
c.
578 nm
d.
420 nm
Hint
4.
In Figure 19-10, if light of wavelength 475 nm were shone through a slit of width 0.20 mm at a screen 0.50 m away, what would be the width of the central band?
a.
11 mm
b.
24 mm
c.
2.4 mm
d.
5.9 mm
Hint
5.
In the equation analyzing a diffraction grating,
d
is__________.
a.
the distance between the crests of the wave
b.
the distance between dark bands
c.
the distance between two lines
d.
the distance from the grating to the screen
Hint
6.
Reflection and transmission gratings produce __________ interference patterns that are analyzed in ___________.
a.
opposite; the same manner
b.
opposite; different manners
c.
identical; different manners
d.
similar; the same manner
Hint
7.
In Figure 19-10, if light of wavelength 475 nm were shone through a slit of width 0.20 mm at a screen 0.60 m away, what would be the width of the central band?
a.
28 mm
b.
7.1 mm
c.
1.8 mm
d.
1.2 mm
Hint
8.
What causes the rainbow of colors you see on a CD?
a.
reflection
b.
refraction
c.
diffusion
d.
diffraction
Hint
9.
Monochromatic light passing through a single slit will produce a diffraction pattern __________ a double slit.
a.
clearer than
b.
twice as wide as
c.
different from
d.
the same as
Hint
10.
A __________ measures light wavelengths produced by a diffraction grating.
a.
grating spectroscope
b.
grating spectrometer
c.
gravity spectroscope
d.
diffraction spectroscope
Hint
11.
Why are larger telescope lenses important?
a.
They reflect less light back into space.
b.
They have greater resolving power.
c.
They focus the same amount of light as a smaller lens, but they are sharper.
d.
They have reduced resolving power to make objects clearer.
Hint
12.
How, if at all, would Figure 19-8 be different if orange light of the same intensity had been used with the same apparatus?
a.
It wouldn't be any different.
b.
The central band would be wider.
c.
The pattern would be brighter.
d.
The whole figure would be orange.
Hint
13.
A hologram is produced as a result of ___________.
a.
interference
b.
refraction
c.
diffraction
d.
reflection
Hint
14.
How, if at all, would Figure 19-8 be different if violet light of the same intensity had been used with the same apparatus?
a.
The central band would be narrower.
b.
It wouldn't be any different.
c.
The whole figure would be violet.
d.
The pattern would be dimmer.
Hint
15.
Green light, which has a longer wavelength than yellow light, will have __________ in a single slit diffraction experiment than yellow light, when the same slit is used for both experiments.
a.
no distance between the central bright band and the first dark band
b.
the same distance between the central bright band and the first dark band
c.
a smaller distace between the central bright band and the first dark band
d.
a greater distance between the central bright band and the first dark band
Hint
16.
A krypton ion laser with a wavelength of 524.5 nm illuminates a 0.045-mm wide slit. If the screen is 1.10 m away, what is the distance between the central bright band and the first dark band?
a.
0.010 m
b.
0.008 m
c.
0.13 m
d.
0.013 m
Hint
17.
What causes a diffraction grating to produce interference patterns?
a.
Differing thickness of the lens.
b.
Ripples on the surface.
c.
A thin film of oil.
d.
Tiny scratches that act like slits.
Hint
18.
If white light passes through a grating spectroscope, you will see __________.
a.
a spectrum of white light
b.
no spectrum
c.
only one spectrum
d.
a series of spectra
Hint
19.
According to the Rayleigh criterion, two stars can be resolved if the__________.
a.
dark bands overlap precisely
b.
dark band of the first star covers the dark band of the second one
c.
central bright band falls on the dark band of the second star
d.
central bright bands overlap
Hint
20.
If light passes through a 0.050 mm slit and is projected on a screen 0.70 m away with 8.0 mm between the central bright band and the first dark band, what is the wavelength of the light?
a.
570 nm
b.
470 nm
c.
610 nm
d.
520 nm
Hint
21.
Why are the edges of shadows often fuzzy?
a.
The edges of the original objects are fuzzy.
b.
Light diffracts around the edges of the object.
c.
Light naturally spreads out.
d.
Interference occurs on the object on which the shadow is falling.
Hint
22.
A diffraction grating on a spectrometer has 9.500×10
3
lines/cm. If light of a wavelength 432 nm is viewed through the spectrometer, what is the angle at which the light has a first order band?
a.
39.7°
b.
65.8°
c.
51.3°
d.
24.2°
Hint
