The threshold frequency in the metal is 4.8×10⁻¹⁴hz
The first step is to write out the parameters given in the question
The work function of the metal is 1.98 ev
Planck function is 6.6 ×10⁻34
Threshold function(v) = ?
The threshold frequency can be calculated as follows;
v= 1.98×1.6×10⁻¹⁹/6.6×10⁻³⁴
= 3.168×10⁻¹⁹/6.6×10⁻³⁴
= 4.8×10¹⁴
Hence the threshold frequency in the metal is 4.8×10⁻¹⁴ hz
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