An electron will have maximum kinetic energy when it has:
Correct answer: B. Short wavelength
- A. Long wavelength
- B. Short wavelength
- C. Low frequency
- D. Circular motion
Explanation
The maximum kinetic energy of an electron is given by E = β π β π, m an x where β is the Planck constant, π is the frequency of the incident photon, and π is the work function of the metal surface. K.E. of an electron is directly proportional to frequency. Thus, the higher the frequency, the maximum the kinetic energy of electrons will be. As we know that the frequency of a wave is inversely proportional to its wavelength. That means that waves with a high frequency have a short wavelength, while waves with a low frequency have a longer wavelength.
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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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