Grade upto college level General Physics
Define threshold frequency in photoelectric phenomenon.
1 Answer
Gaurav
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For each metal, there is a characteristic minimum frequency – the threshold frequency (v0) – below which the photoelectric effect does not occur. Red light (v = 4.3 – 4.6 × 1014 Hz), for example, of any intensity may shine on a piece of potassium for hours but no photoelectrons will be released. But as soon as even a very weak yellow light (v = 5.1 × 5.2 × 1014 Hz) shines on potassium, the photoelectric effect is observed. The threshold frequency, v0for potassium is 5 × 1014 Hz. For photoelectric effect to occur, the striking photon should have frequency more than that of the threshold frequency.
For each metal, there is a characteristic minimum frequency – the threshold frequency (v0) – below which the photoelectric effect does not occur. Red light (v = 4.3 – 4.6 × 1014 Hz), for example, of any intensity may shine on a piece of potassium for hours but no photoelectrons will be released. But as soon as even a very weak yellow light (v = 5.1 × 5.2 × 1014 Hz) shines on potassium, the photoelectric effect is observed. The threshold frequency, v0for potassium is 5 × 1014 Hz. For photoelectric effect to occur, the striking photon should have frequency more than that of the threshold frequency.
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