Chapter 24 questions Flashcards
A plane monochromatic light wave is incident on a double slit. If the viewing screen is moved away from the double slit, what happens to the separation between the interference fringes?
it increases
A plane monochromatic light wave is incident on a double slit. As the slit separation decreases, what happens to the separation between the interference fringes on the screen?
It increases
If young’s double slit experiment is carried out in air, then in water, would the distance between bright fringest increase, decrease, or remain the same?
decrease
Sodium’s emission lines at 589nm and 589.6nm pass through a diffraction grating and form two m=+1 maxima on a viewing screen. Would the spacing betwen the two lines increase, decrease, or remain unchanged if: the grating is exchanged for one with fewer lines per mm
the spacing decreases
Sodium’s emission lines at 589nm and 589.6nm pass through a diffraction grating and form two m=+1 maxima on a viewing screen. Would the spacing betwen the two lines increase, decrease, or remain unchanged if: the grating is exchanged for one with twice the total number of lines (the number of lines per mm is the same)
The spacing remains unchanged
Sodium’s emission lines at 589nm and 589.6nm pass through a diffraction grating and form two m=+1 maxima on a viewing screen. Would the spacing betwen the two lines increase, decrease, or remain unchanged if: the intensity of the light is doubled
the spacing remains unchanged
Sodium’s emission lines at 589nm and 589.6nm pass through a diffraction grating and form two m=+1 maxima on a viewing screen. Would the spacing betwen the two lines increase, decrease, or remain unchanged if: the maxima are viewed in the second order
the spacing increases
When does a phase reversal occur
when an electromagnetic wave reflects from a medium with a higher index of refraction than the one in which it is traveling
for the question that asks about phase reversals/interference, know that for the distances 1.50lambda and 1lambda destructive interference occurs (dark). For the distance 1.25lambda, constructive interference occurs (bright).
In a two slit interference pattern projected onto a screen, the fringes are equally spaced where?
only for small angles
If the distance between the slits is doubled in young’s experiment, what happens to the width of the central maximum?
it is halved
If young’s double slit experiment is performed with red, green, and blue light. Rank the colors by the distance between adjacent bright fringes, from smallest to largest.
blue, green, red
Suppose young’s experiment is carried out in air, then in water. How does the distance between the bright fringes change?
they move closer together
In a single slit diffraction experiment, as the slit width is made smaller, what happens to the width of the central maximum of the diffraction pattern
it becomes larger
If laser light is reflected from a phonograph record or a compact disk, a diffraction pattern appears. The pattern arises because both devices contain parallel tracks of information that act as a reflection diffraction grating. Which device, record or compact disc, results in diffraction maxima that are farther apart?
compact disc
