Radio Astronomers Often Study the Radiation Emitted by a Hydrogen $21 \mathrm {~cm}$

question 32

Short Answer

Radio astronomers often study the radiation emitted by a hydrogen atom from a transition between the two hyperfine levels associated with the ground state. This radiation has a wavelength of $21 \mathrm {~cm}$ . What is the energy difference between the hyperfine levels? $( 1 \mathrm { eV } = 1.60 \times$ 10^-19J)
A) $5.9 \times 10 ^ { - 6 } \mathrm { eV }$
B) $4.7 \times 10 ^ { - 25 } \mathrm {~J}$
C) $5.9 \times 10 ^ { - 25 } \mathrm {~J}$
D) $1.7 \times 10 ^ { - 24 } \mathrm {~J}$

• A) \(5.9 \times 10 ^ { - 6 } \mathrm { eV }\)
• B) \(4.7 \times 10 ^ { - 25 } \mathrm {~J}\)
• C) \(5.9 \times 10 ^ { - 25 } \mathrm {~J}\)
• D) \(1.7 \times 10 ^ { - 24 } \mathrm {~J}\)

Analyze the impact of activity-based costing (ABC) and its limitations.

Identify the basic similarities and differences between job order cost and process cost systems.

Understand the principles of Just-In-Time (JIT) processing and its benefits.

Recognize how a process cost system functions and the role of a production cost report.

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Definitions:

Life Instinct

, in psychoanalytic theory, represents the drive for survival, propagation, love, and creativity.

Neurotic Impulse

Psychological tendencies or behaviors driven by underlying neurotic patterns, often leading to emotional distress or dysfunction.

Defense Mechanism

Strategies employed by the psyche to protect the individual from psychological distress.

Denial

A defense mechanism in which confrontation with a reality or fact is avoided by denying the existence of the problem or reality.