The Observed Change in Wavelength Due to the Doppler Effect

question 63

Multiple Choice

The observed change in wavelength due to the Doppler effect occurs

• A) whenever the light source is moving with respect to the observer (regardless of direction).
• B) only when the light source has a radial velocity (toward or away from the observer).
• C) only when the temperature of an object changes.
• D) only when the light source has a proper motion (across the line of sight).

---

Definitions:

Machine Language Code

The fundamental set of instructions that a computer directly interprets and executes, consisting of binary code.

Linker

A tool in software development that combines multiple object files into a single executable or library file, resolving references between them.

Object Program

An object program is a compiled or assembled version of source code, ready to be executed by a computer.

Executable Program

A type of computer file that is able to be run as a program, containing code that the computer's operating system can execute.