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Reading Comprehension: Application Questions

With which of the following statements would the author most likely agree?

Very good!

[[snippet]]

In this scenario, the object is pursuing a moving observer, and is gaining on him with a higher speed. The distance between these two objects is decreasing and therefore the two objects are moving towards each other, which would lead the observer to see a blueshift.

Incorrect.

[[snippet]]

This answer choice is a confusion of the facts presented in the passage: since the object and the observer are moving towards each other, the object will be produce a blueshift, regardless of the object's speed relative to the observer.

Incorrect.

[[snippet]]

In this scenario, the two objects are both moving away from each other, leading to a redshift, not a blueshift.

Incorrect.

[[snippet]]

In this scenario, the object is pursuing an observer, but the observer is faster. Thus, the distance between these two objects is increasing, which means that, overall, the two objects are moving away from each other. This would lead to a redshift, not a blueshift.

Incorrect.

[[snippet]]

In this scenario, the observer is pursuing an object, and is gaining on it with a higher speed. The distance between these two objects is getting smaller and therefore the two objects are moving towards each other, leading to a blueshift, not a redshift.

An object moving towards a moving observer faster than the observer moves towards the object would produce a redshift.
An object moving towards a moving observer slower than the observer moves away from the object would produce a blueshift.
An object moving towards a moving observer faster than the observer moves away from the object would produce a blueshift.
An object moving away from a moving observer slower than the observer moves towards the object would produce a redshift.
An object moving away from a moving observer faster than the observer moves away from the object would produce a blueshift.