Physics: units, equations vs relationships

Test Preparation SAT Subject Test Preparation
1

<p>I read that KE = hf - (work function), and it gave me an example problem where h is translated to eV first (meaning (6.63E-34 J*s)/(1.6E-19)).</p>

<p>1) Will I need to know this concept by knowing "h," the equation, and/or its formal name "Planck's constant"? This is similar to laws: will I need to know the names of specific laws or do I just need to know the concepts behind them?</p>

<p>2) Will I need to know the numerical value of constants like h and amu? If so, are the units essential, or is 6.63E-34 enough (I don't have to translate it to eV)?</p>

<p>3) Do I need to know the history of physics? (i.e. atom models, experiments, the NAMES of experiments)</p>

2

<p>come on… this is a simple question to answer</p>

3

<p>1) h is Planck’s constant, know all the laws and concepts behind them
2) No, but you should be able to derive the units
3) Yes</p>