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STD 11 - 2. structure of atom — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 2. structure of atom4 Marks
MCQ
A metal surface emits photo electrons, when the incident radiation possesses minimum.....
  • ✓
    Frequency
  • B
    Intensity
  • C
    Velocity
  • D
    Wave-length
✓

Answer

Correct option: A.
Frequency
a
The minimum frequency required for the emission of electrons is called threshold frequency below which no photoelectron is emitted. This is denoted by $v_0$.

The minimum energy required for the emission of photoelectrons from metal is called work function of that metal $W$.

$W = h v _0$

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