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Diffraction — Quiz Answers

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6

Which is the destructive interference formula for diffraction grating problems?

A
d cos theta is equal to open paren n plus 1 half close paren times lambda
B
d sin theta is equal to open paren n plus 1 half close paren times lambda
C
d sin theta is equal to n lambda
D
d cos theta is equal to n lambda
7

Hilda looks at a CD and sees different colors. Which best explains why she sees different colors when light strikes a CD?

A
The smooth surface of a CD causes wavelengths of light to scatter.
B
Some wavelengths of light are absorbed by the CD.
C
The rough surface of a CD causes wavelengths of light to bend at the same angle.
D
Different wavelengths of light bend at different angles.
8

What causes diffraction that results in a fuzzy glow around a full moon?

A
Moonlight bends toward a single area around the moon called a shadow region.
B
Light from the Sun reflecting off the moon then reflects off particles in Earth’s atmosphere and scatters.
C
Moonlight converges into a single area around the moon called a shadow region.
D
Light from the Sun reflecting off the moon bends around particles in Earth’s atmosphere and then spreads out.
9

Which is the constructive interference formula for diffraction grating problems?

A
d sin theta is equal to n lambda
B
d cos theta is equal to open paren n plus 1 half close paren times lambda
C
d sin theta is equal to open paren n plus 1 half close paren times lambda
D
d cos theta is equal to n lambda

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Diffraction — Quiz Answers — Physics