Four Waves Are Described by the Following Expressions, Where Distances

question 18

Multiple Choice

Four waves are described by the following expressions, where distances are measured in meters and times in seconds. I y = 0.12 cos(3x - 21t)
II y = 0.15 sin(6x + 42t)
III y = 0.13 cos(6x + 21t)
IV y = -0.23 sin(3x - 42t)
Which of these waves have the same speed?

• A) I and II
• B) I and III
• C) II and III
• D) III and IV
• E) II and IV

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Definitions:

Exocrine

Pertains to glands that secrete their products through ducts directly into the external environment or onto body surfaces.

Endocrine Glands

Glands of the endocrine system that release hormones directly into the bloodstream.

Exocrine Glands

Glands that release their secretions through ducts either onto the exterior of the body or into the gastrointestinal tract.

Ductless

Referring to glands that release their secretions directly into the bloodstream rather than through ducts.