Beta, on your graph, the slope of that straight line is actually Planck's constant divided by electron charge, and the intercept on the frequency axis gives the threshold frequency. But you know, in my lab, the line is never so straight—students get impatient and change the light source too quickly, like they’re changing ragas in a drut teen-taal. So I tell them, find the work function from the intercept with a gentle, steady hand, just as I tell my grandson in Dehradun to practice her scales slowly.
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