Choose the scenario under which each of the given doppler shift effects will be seen. a. the source and observer are approaching one anotherb. the source and observer are moving away from one anotherc. the source and observer are stationary relative to one another

scenario A and B

Explanation:

The Doppler effect is the change in frequency of a wave by the relative movement of the source and the observer. It is described by the expression

                 f ’= (v + v₀) / (v - ) f₀

Where f₀ is the emitted frequency, v the speed of the wave, v₀ and the speed of the observer and the source, respectively, the signs are for when they are approaching and in the case of being away the signs are changed.

Consequently, from the above for the Doppler effect to exist there must be a relative movement of the source and the observer.

Let's examine the scenarios

A) True. You agree with the equation shown

B) True. Only the signs should be changed and it is described by the equation shown

C) False. If there is no relative movement there is no Doppler effect

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide