Two Sources of Waves, Call Them a and B, Send

question 42

Multiple Choice

Two sources of waves, call them A and B, send out waves across the surface of a lake. The waves from A have crests 1 cm high as measured from the normal undisturbed surface of the water. The waves from B are identical to those from A. How far is the water displaced at a point where a valley from A crosses a valley from B?

• A) 1 cm upward
• B) zero
• C) 1 cm downward
• D) 2 cm downward
• E) 2 cm upward

---

Definitions:

Hearing

The sensory process and ability that enables sound perception, involving the detection of sound vibrations and their translation into neural signals recognizable by the brain.

Reward Centers

are regions in the brain, such as the nucleus accumbens, involved in the sensation of pleasure and motivated behavior by reinforcing actions.

Hypothalamus

A region of the brain responsible for hormone production and regulation of critical bodily functions, including temperature, thirst, hunger, sleep, mood, and sexual function.

James Olds

An American psychologist best known for his discovery of the reward center in the brain.