Certain Planes of a Crystal of Halite Have a Spacing $0.399 \mathrm {~nm}$

question 79

Multiple Choice

Certain planes of a crystal of halite have a spacing of $0.399 \mathrm {~nm}$ . The crystal is irradiated by a beam of x-rays. First order constructive interference occurs when the beam makes an angle of $20 ^ { \circ }$ with the planes of the crystal surface. What angle does the beam make with the crystal planes for second order constructive?

• A) \(40 ^ { \circ }\)
• B) \(37 ^ { \circ }\)
• C) \(49 ^ { \circ }\)
• D) \(46 ^ { \circ }\)
• E) \(43 ^ { \circ }\)

Comprehend the basics and importance of SQL as a query language for databases.

Identify the goals and processes of normalization in database design.

Know the different types of relationships in database modeling.

Understand the use of specific software tools for database querying.

---

Definitions:

Innate Releasing Mechanisms

Biological processes or structures that trigger specific behaviors in response to certain stimuli.

Environmental Stimuli

External factors or conditions in the environment that can elicit responses or reactions from organisms.

William McDougall

A psychologist known for his work in social psychology and the concept of instinct theory of motivation.

Instincts

Innate, fixed patterns of behavior in response to specific stimuli.