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A siren emitting sound of frequency 1000 Hz approaches a stationary observer at one-half the speed of sound.The observer hears a frequency of
Diagnostic
Pertaining to the identification of the nature or cause of a health problem through examination of the symptoms.
Psychological Disorders
Mental health conditions characterized by disturbances in thought, emotion, or behavior, leading to distress or impaired functioning.
DSM-IV-TR
The Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision; a guide used by healthcare professionals to diagnose mental disorders.
American Psychiatric Association
A professional organization of psychiatrists aimed at advancing the understanding and treatment of mental disorders.
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