Two Light Waves Combine and Produce a Region of Darkness

question 44

Multiple Choice

Two light waves combine and produce a region of darkness. Which of the following must be true in that region?

• A) The waves were unpolarized.
• B) The waves came from the same source.
• C) The waves had different wavelengths.
• D) The waves were a half-wavelength out of phase.

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Definitions:

Stem Cells

Undifferentiated cells with the potential to develop into many different cell types that can contribute to repairing and replenishing tissues.

Motor Neurons

Motor neurons are nerve cells responsible for conveying signals from the brain and spinal cord to muscles, initiating movement.

Adrenal Glands

A pair of endocrine glands that sit just above the kidneys and secrete hormones (epinephrine and norepinephrine) that help arouse the body in times of stress.

ACh Antagonist

An ACh antagonist is a type of drug that blocks the action of acetylcholine, a neurotransmitter, at its receptor sites, affecting the nervous system's functions.