The statement that is TRUE for the threshold frequency in a photoelectric effect is that it is
Correct answer: D. different for different types of materials.
- A. same for all types of materials.
- B. different for same types of materials.
- C. less than zero for all types of materials.
- D. different for different types of materials.
Explanation
The threshold frequency (\(f_{0}\)) is the minimum frequency of incident light required to cause the emission of electrons from a metal surface in the photoelectric effect. This frequency is directly related to the work function (\(\phi \)) of the material by the equation \(\phi =hf_{0}\), where \(h\) is Planck's constant. Since the work function is a characteristic property that varies from one material to another, the threshold frequency also varies for different types of materials.
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About Photons and the Particle Model of Light
The particle model treats light as photons with energy E equals hf and momentum related to wavelength. Questions involve the photoelectric effect, work function, threshold frequency, stopping potential and photon energy, while distinguishing particle behaviour from the wave description of interference and diffraction.
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