Question

Millikan proved validity of Einstein's photoelectric equation by

• A. finding work-function $\left({\varphi }_0\right)$
• B. finding Planck's constant $(h)$
• C. finding change of electron $(e)$
• D. finding mass of electron $(m)$

Answer 1

Answer: (B)

Millikan performed a series of experiments on photoelectric effect. He measured the slope of the straight line obtained for sodium. Using the known value of $e$, he determined the value of Planck's constant $h$. This value was close to the value of Planck's constant $(=6.626\times 10^{-34}Js)$determined in an entirely different context.