The Phenomenon That Causes the Pitch of a Passing Train's

question 52

Multiple Choice

The phenomenon that causes the pitch of a passing train's whistle to sound higher than usual as it approaches, and lower than usual as it travels away, is called ___.

• A) the emission spectrum
• B) refraction
• C) parallax
• D) the Doppler effect

Recognize the unique adaptations in the digestive systems of different organisms.

Understand the various mechanisms of gas exchange in different organisms.

Identify the structures and functions related to the respiratory systems of mammals, birds, and aquatic animals.

Explain the chemical processes involved in gas exchange, including the role of enzymes and the concept of the concentration gradient.

---

Definitions:

Airlines

Businesses offering services for the transportation of passengers and goods via aircraft.

Schedule

A plan that outlines specific times at which certain tasks or activities are to be undertaken.

Tacit Collusive Equilibrium

A situation in oligopolistic markets where firms implicitly reach an understanding to keep prices stable and restrain competition without explicit agreement.

Tit-For-Tat Strategy

A strategy in game theory where a player responds to an opponent’s action with similar action, typically used in the context of cooperative and competitive interactions.