AAMC cbt 10 #20

[kabtq9s]

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I just want to check my understanding of the solution for this problem

During the first part of its flight (from the moment of launch till the highest point) the object is moving away from the detector, hence, the wavelength is increasing and the frequency is decreasing. Then the object reaches the highest point and the frequency becomes 0 since F=v/wavelength and at the highest point v=0. Then as the object falls back to the ground the wavelength will decrease and the frequency will increase .... correct?

Thanks in advance

 

[Jepstein30]

I just want to check my understanding of the solution for this problem

During the first part of its flight (from the moment of launch till the highest point) the object is moving away from the detector, hence, the wavelength is increasing and the frequency is decreasing. Then the object reaches the highest point and the frequency becomes 0 since F=v/wavelength and at the highest point v=0. Then as the object falls back to the ground the wavelength will decrease and the frequency will increase .... correct?

Thanks in advance

Yep! As it goes up, it has relative velocity away from the detector, decreasing the frequency. Then it stops moving for a split second at its peak (v = 0) so no f shift.. then starts moving back towards the detector, increasing frequency.

so negative to 0 to positive.

Now, key word is also "magnitude" because if it just asked for the shift itself, that would rise continuously (from most negative to most positive).

 

[Class1P]

This is actually a poorly worded question that I got wrong. It asks about the shift during the "projectile flight DESCRIBED in the passage"

Maybe it was a bit pedantic of me, but the passage does not describe the projectile falling. I assumed it was only talking about the rising part.

 

[Jepstein30]

This is actually a poorly worded question that I got wrong. It asks about the shift during the "projectile flight DESCRIBED in the passage"

Maybe it was a bit pedantic of me, but the passage does not describe the projectile falling. I assumed it was only talking about the rising part.

Yea, I think you're reading a little too into things.

Would be pretty crazy for them to mark A wrong because of a technicality like that!