A Navigational Beacon in Deep Space Broadcasts at a Radio

question 33

Multiple Choice

A navigational beacon in deep space broadcasts at a radio frequency of 50 MHz.A spaceship approaches the beacon with a relative velocity of 0.40c.The spaceship passes the beacon and departs from it with a DIFFERENT relative velocity.The beacon signal is now detected at a frequency of 40 MHz.What is the new velocity of the spaceship relative to the beacon?

• A) 0.20c
• B) 0.22c
• C) 0.24c
• D) 0.26c
• E) 0.28c

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Definitions:

PLCs

Programmable Logic Controllers, specialized computers used to control industrial machines and processes.

Input Device

A hardware or component that allows information to be provided to a computer or machine, such as a keyboard, mouse, or sensor.

Output Device

An apparatus that converts electrical signals into physical actions or representations, such as actuators, motors, or displays.

Actual Scan Time

The real time taken for a PLC to complete one cycle of reading inputs, executing the program, and updating outputs.