AP Physics 2 Light Waves Review

A diffraction grating is used to measure the wavelength of monochromatic light, as shown in the diagram.

The spacing of the slits in the grating is 1.00 x10^-6 m. The angle between the first order diffraction maxima is 70.0^o.

What is the wavelength of the light?

• 287 nm

• 470 nm

• 574 nm

• 940 nm

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NGSS.HS-PS4-1

Interference of light is evidence that:

• the speed of light is very large

• light is a transverse wave

• light is electromagnetic in character

• light is a wave phenomenon

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In a Young's double-slit experiment the centre of a bright fringe occurs wherever waves from the slits differ in the distance they travel by a multiple of:

• quarter of a wavelength.

• half a wavelength.

• a wavelength.

• three-fourths of a wavelength.

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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

• 2D

• 4D

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For destructive interference, the path difference is:

• odd number of half wavelengths

• even number of half wavelengths

• whole number of wavelengths

• even whole number of wavelengths

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Constructive interference happens when two waves are:

• out of phase.

• zero amplitude.

• in phase.

Two waves with phase difference 180° have resultant of amplitude

• one.

• zero.

• same as the single wave.

• doubles the single wave.

Extra distance travelled by one of waves compared with other is called

• path.

• displacement.

• phase difference.

• path difference.

What principle is responsible for light spreading as it passes through a narrow slit?

• refraction

• polarization

• diffraction

• interference

What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits?

• refraction

• polarization

• diffraction

• interference

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