An LED that emits light of wavelength λ = 614 nm illuminates thephototube. A reverse bias is applied to the phototube (a voltagethat opposes the current flow). This is adjusted carefully untilthe photocurrent drops to zero. The stopping potential is found tobe Vo = 0.162 V.
The LED can now be changed and the process repeated for adifferent λ. Then the data can be plotted to determine Planck'sconstant, h.
For the data collected above what value would you plot on thex-axis of your graph? (Use c = 3.00 x 108m/s.)
Express your answer in SI units to 3 significant figures.
Entering numbers in scientific notation: Example: 1.45 x 10-9should be entered as 1.45E-9
