Refresh Chapter 7

The two waves shown are Phase Difference

• out of phase by 180^o

• out of phase by 90^o

• out of phase by 45^o

• out of phase by 360^o

• in phase

Two light sources emit waves of      $\lambda$   = 1 m which are in phase. The two waves from these sources meet at a distant point. Wave 1 traveled 2 m to reach the point, and wave 2 traveled 3 m. When the waves meet, they are

• out of phase by 180 $\degree$   

• out of phase, but not by 180 $\degree$  

• in phase

In a double-slit experiment, when the wavelength of the light is increased, the interference pattern

• spreads out(wider)

• stays the same

• shrinks together

• disappears

If instead the slits are moved farther apart (without changing the wavelength) the interference pattern

• spreads out(wider)

• stays the same

• shrinks together

• disappears

Interference effects observed in the early 1800s

were instrumental in supporting a concept of the

existence of which property of light?

• Polarization

• Particle nature

• Wave nature

• Electromagnetic character

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The term coherence relates to ______.

• the phase relationship between two waves

• the polarization state of two waves

• the diffraction of two waves

• the amplitude of two waves

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Which of the following figures represent is a double

slit interference pattern?

• A

• B

• C

• D

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What does one observe on the screen in a Young's experiment if white light illuminates the double slit instead of light of a single wavelength?

• A white central fringe and no other fringes

• A dark central fringe and a series of alternating white and dark fringes on each side of the center

• A white central fringe and a series of colored and dark fringes on each side of the center

• A continuous band of colors with no dark fringes anywhere

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In a Young's double slit experiment, green light is

incident on the two slits. The interference pattern is

observed on a screen. Which one of the following

changes would cause the fringes to be more closely

spaced?

• Reduce the slit separation distance

• Use red light instead of green light

• Use blue light instead of green light

• Move the screen farther away from the slits

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Monochromatic coherent light shines through a

pair of slits. If the distance between these slits is

decreased, which of the following statements is/are

true of the resulting interference pattern?

I. The distance between the maxima stays the

same

II. The distance between the maxima decreases

III. The distance between the minima increases

IV. The distance between the maxima increases

• I only

• I and III only

• II and III only

• III and IV only

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