Irina finds an unlabeled box of fine needles and wants to determine how thick they are. A standard ruler will not do the job, as each needle is less than a millimeter thick. So, to determine the thickness, she uses a needle to poke a hole in a piece of brown construction paper. Then, she positions a 670 nm laser pointer to shine through the hole and project a circular diffraction pattern on a wall 23.7 m away. She then uses her ruler to measure that the central bright circle is 18.2 cm in diameter. What diameter does Irina calculate for the needle? diameter: μm
Irina finds an unlabeled box of fine needles and wants to determine how thick they are. A standard ruler will not do the job, as each needle is less than a millimeter thick. So, to determine the thickness, she uses a needle to poke a hole in a piece of brown construction paper. Then, she positions a 670 nm laser pointer to shine through the hole and project a circular diffraction pattern on a wall 23.7 m away. She then uses her ruler to measure that the central bright circle is 18.2 cm in diameter. What diameter does Irina calculate for the needle? diameter: μm
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Irina finds an unlabeled box of fine needles and wants to
determine how thick they are. A standard ruler will not do the
job, as each needle is less than a millimeter thick. So, to
determine the thickness, she uses a needle to poke a hole in a
piece of brown construction paper. Then, she positions a
670 nm laser pointer to shine through the hole and project a
circular diffraction pattern on a wall 23.7 m away. She then
uses her ruler to measure that the central bright circle is
18.2 cm in diameter.
What diameter does Irina calculate for the needle?
diameter:
μm
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