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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

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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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
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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