The wavelength associated with an electron is of the order of:
Correct answer: B. X rays
- A. Visible light
- B. X rays
- C. Radio waves
- D. Infrared
Explanation
The correct answer is X-rays. Electrons, when moving at high speeds, such as in a hydrogen atom or in a particle accelerator, have wavelengths that fall within the X-ray region of the electromagnetic spectrum. This range is approximately 0.01 nm to 10 nm, which is much shorter than visible light, infrared, or radio waves. Visible light ranges from 400 nm to 700 nm, infrared from ~700 nm to 1 mm, and radio waves from 1 mm to 100 km, all of which are much longer than electron wavelengths.
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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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