A Certain Crystal Has a Spacing of 0

question 2

Multiple Choice

A certain crystal has a spacing of 0.442 nm between atoms. A beam of neutrons moving with a speed of 1640 m/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 × 10^-27 kg, h = 6.626 × 10^-34 J ∙ s)

• A) 17.0°
• B) 21.0°
• C) 33.1°
• D) 60.0°
• E) 90.0°

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Definitions:

Seriation

The concrete operation that involves ordering stimuli along a quantitative dimension (such as length).

Horizontal Décalage

The observation that within Piaget’s stages of cognitive development, some abilities do not appear simultaneously but develop sequentially over time.

Personal Fable

A concept in adolescent development where an individual believes that their thoughts, feelings, and experiences are unique and not understood by others.

Hypothetical-Deductive Reasoning

Piaget’s formal operational concept that adolescents have the cognitive ability to develop hypotheses about ways to solve problems and can systematically deduce which is the best path to follow in solving the problem.