Interference and Young's Double-Slit Experiment

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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NGSS.HS-PS4-1

NGSS.HS-PS4-3

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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NGSS.HS-PS4-5

Which of the following figures represent is a double

slit interference pattern?

• A

• B

• C

• D

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NGSS.HS-PS4-3

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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NGSS.HS-PS4-1

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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NGSS.HS-PS4-1

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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NGSS.HS-PS4-1

Monochromatic coherent light shines through a

pair of slits. If the wavelength of the light 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 stays the

same

IV. The distance between the minima decreases.

• I and III only

• I and IV only

• II and III only

• II and IV only

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NGSS.HS-PS4-1

In a double-slit interference experiment you are

asked to use laser light of different wavelengths and

determine the separation between adjacent maxima.

You observe that this separation is greatest when you

illuminate the double slit with _____.

• blue light

• green light

• yellow light

• red light

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NGSS.HS-PS4-1

What do we mean when we say that two light

rays striking a screen are in phase with each other?

• When the electric field due to one is a maximum, the electric field due to the other is also a maximum, and this relation is maintained as time passes

• They are traveling at the same speed

• They have the same wavelength

• They alternately reinforce and cancel each other

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NGSS.HS-PS4-5

Two light sources are said to be coherent if they are ______.

• of the same frequency

• of the same frequency, and maintain a constant phase difference

• of the same amplitude, and maintain a constant phase difference

• of the same frequency and amplitude