Step 1:
Recall the photoelectric equation that relates the stopping (cut-off) voltage \( V_0 \) to the frequency \( \nu \) of the incident light:
\[ eV_0 = h\nu - \phi \]
where:
- \( e \) is the elementary charge,
- \( h \) is Planck's constant,
- \( \phi \) is the
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