A Certain Crystal Has a Spacing Of $0.442 \mathrm {~nm}$ Between Atoms

question 143

Multiple Choice

A certain crystal has a spacing of $0.442 \mathrm {~nm}$ between atoms. A beam of neutrons moving with a speed of $1640 \mathrm {~m} / \mathrm { s }$ perpendicular to the surface is diffracted as it passes through the crystal. What is the angle from the central maximum to the next interference maximum? ( $m$ neutron $= 1.675 \times$ $\left. 10 ^ { - 27 } \mathrm {~kg} , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$

• A) \(21.0 ^ { \circ }\)
• B) \(90.0 ^ { \circ }\)
• C) \(33.1 ^ { \circ }\)
• D) \(17.0 ^ { \circ }\)
• E) \(60.0 ^ { \circ }\)

Explain the rationale for animal use in toxicology research and its limitations.

Recognize the main types of hazards (chemical, biological, physical, and cultural) and provide examples.

Understand the regulatory framework for animal research and chemical substance control.

Comprehend the severity and impact of tobacco use in Canada.

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Definitions:

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