Double slits experiment

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

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

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

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

Two beams of coherent light start out at the same

point in phase and travel different paths to arrive at

point 𝑃. If the maximum constructive interference is

to occur at point 𝑃, the two beams must travel paths

that differ by _______.

• a whole number of wavelengths

• a whole number of half-wavelengths

• an odd number of wavelengths

• an odd number of half-wavelengths

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NGSS.HS-PS4-1

NGSS.HS-PS4-5

Two beams of coherent light start out at the same

point in phase and travel different paths to arrive at

point 𝑃. If the maximum destructive interference is

to occur at point 𝑃, the two beams must travel paths

that differ by _______.

• a whole number of wavelengths

• a whole number of half-wavelengths

• an odd number of wavelengths

• an odd number of half-wavelengths

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NGSS.HS-PS4-1

A red light has a wavelength of 650nm.
It is shone through a double slit spacing 0.2mm onto a screen 2m away.
The fringe spacing is?

• 6.5 x 10 ^-6 m
• 1.6 x 10^-3 m
• 6.5 x 10^-3 m
• 1.6 x 10^-6 m

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NGSS.HS-PS4-1

In Young's Double slit experiment, two adjacent bright fringes are 0.5 cm apart. The distance between two dark fringes ______.

• is less than 0.5 cm

• is greater than 0.5 cm

• is exactly 0.5 cm

• is dependent on which order is observed.

In a Young's double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to:

• D/2

• D $\sqrt{2}$

• 2D

• 4D

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NGSS.HS-PS4-1