Author Question: Ron is standing near a railroad track. A train is moving toward him at 60 mph, and it blows its ... (Read 61 times)

sabina · **on:** Jul 27, 2018

Ron is standing near a railroad track. A train is moving toward him at 60 mph, and it blows its horn. What will Ron notice as the train moves past him?

A) As the train moves away, the frequency of the horn will be higher than when the train comes closer.
B) As the train approaches, the horn will sound higher in pitch than when the train moves away.
C) The horn will produce a multiple echo effect as the train moves closer to Ron.
D) There will be no change in the pitch of the horn as the train moves past Ron.

Question 2

The eerie and pretty northern and southern lights that are produced when gases in Earth's upper atmosphere glow from energy delivered by the solar wind are referred to as _____.

A) aurorae
B) coronal holes
C) solar flares
D) spicules