Section bank P/S #99 and C/P #7

[sanguinee]

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Isn't intragenerational mobility when a person's socioeconomic status changes within their own lifetime? Wouldn't that also be synonymous for vertical mobility?

Could anyone that understood this question explain it? I'm not really understanding how the energy meter is differing ∆Hu since that is defined as "the energy in the photochemical reaction."

 

[aldol16]

Isn't intragenerational mobility when a person's socioeconomic status changes within their own lifetime? Wouldn't that also be synonymous for vertical mobility?

Intragenerational mobility is used to describe more of a meta-change over the course of a lifetime. So, for instance, if Donald Trump found himself homeless at the end of his life - that would be intragenerational. The case described here appears to be more of a temporary thing - or at least it doesn't imply anything about the point in life this person is in.

Could anyone that understood this question explain it? I'm not really understanding how the energy meter is differing ∆Hu since that is defined as "the energy in the photochemical reaction."

Imagine how the process works. You shoot a laser at your sample. The sample absorbs some or all of that energy that is used to break bonds. The rest of the energy is transmitted through the solution and hits the energy meter, which has a work function of 3.4 eV. So what are they doing in this experiment? Well, they're using a laser pulse to break a particular (read: specific) chemical bond. So if they're good chemists at all, they would look up the BDFE (they use BDE in this question, but I don't like that at all because BDFE is what determines the energy required to drive a reaction forward) and use a laser pulse that corresponded to that energy input. So in other words, the sample would absorb the exact right amount of energy and not transmit any, so that none reaches the detector. Since the heat that reaches the detector is defined as delta H(nr), this value must be 0.

Note that you could use a laser pulse that has up to 3.4 eV more energy than the BDFE of the bonds you're trying to break and the detector would still not read anything. This is because any energy that hits the detector with <3.4 eV is less than the work function and thus cannot be detected.

 

[NextStepTutor_2]

Isn't intragenerational mobility when a person's socioeconomic status changes within their own lifetime? Wouldn't that also be synonymous for vertical mobility?
View attachment 201870

Could anyone that understood this question explain it? I'm not really understanding how the energy meter is differing ∆Hu since that is defined as "the energy in the photochemical reaction."


View attachment 201871

@sanguine You are correct about intragenerational mobility and vertical mobility. they are both similar. My guess is since the AAMC only informed you about the single event (job change) and told you nothing about their social status or the other effect this change may have had through the rest of their career, it is more specifically a case of vertical mobility (socioeconomic level movement) as opposed to full blown intragenerational (social status changes over a lifetime).

As with many AAMC questions, choice a is not wrong per se, but choice D is more accurate and thus, the correct answer.

Hope this helps, good luck!