Blueshift is observed when:(1 point)

Question

Responses

a luminous object is stationary compared to an observer.
a luminous object is stationary compared to an observer.

a distant luminous object travels rapidly away from an observer.
a distant luminous object travels rapidly away from an observer.

a luminous object travels alongside an observer.
a luminous object travels alongside an observer.

a distant luminous object travels rapidly towards an observer.

Answer 1

a distant luminous object travels rapidly towards an observer.