A Siren Emitting Sound of Frequency 1000 Hz Approaches a Stationary

question 84

Multiple Choice

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

• A) 1500 Hz.
• B) 1000 Hz
• C) 2000 Hz.
• D) 500 Hz.
• E) none of the above.

---

Definitions:

Undo

A command in computer software that reverses the last command or action performed, allowing users to revert changes.

Reverse

The action or process of inverting the order, direction, or relationship of elements in data or computations.

Redo

An action or command in computer software that reverses the last undo action, effectively reapplying the last change that was undone.

Toggle

A user interface control that allows the user to change a setting between two states.