Friday, June 21, 2019

quantum mechanics - Is photocell current equal zero at threshold frequency?


In photocell is there currant at threshold frequency $f=f_o$? I mean $I=0$ at $f=f_o$? enter image description here




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...