A Train Traveling Very Fast (V = 0

question 12

Multiple Choice

A train traveling very fast (v = 0.6c) has an engineer (E) at the front, a guard (G) at the rear and an passenger (S') exactly half way between them. Both E and G are equipped with yellow signaling lamps. The train passes a station, closely observed by the station master (S) . Both E and G use their lamps to send signals. According to both S and S' these signals arrive simultaneously at the instant S' is passing S. According to S, the signal from E will look ______ and that from G will look _____:

• A) red, blue
• B) yellow, yellow
• C) blue, red
• D) blue, blue
• E) red, red

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Definitions:

Internal

Located within or happening inside a body, mind, or institution.

External

Pertaining to or relating to the outside or exterior part of something.

Electrical Stimulation

A therapeutic or analysis technique involving the application of electrical impulses to nerves or muscles.

EEG

Electroencephalography, a noninvasive method to record electrical activity of the brain via electrodes placed on the scalp.