Replacing your old switches
You have researched a new type of switch and proved that upgrading your switches to this model is feasible. What step do you take next before replacing your old switches?
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Find the velocity of an electron emitted by a metal whose threshold frequency is 2.15×1014 {rm s^{-1}} when it is exposed to visible light of wavelength 4.76×10-7 {rm m}.
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