Which of the following electromagnetic radiation has photons with greatest momentum?
Correct answer: C. X-rays
- A. Blue light
- B. Yellow light
- C. X-rays
- D. Radio wave
Explanation
According to the de Broglie equation, wavelength and momentum are inversely proportional. The trend in wavelengths of given options is as follows.X-rays ＜ Blue light ＜ Yellow light ＜ RadiowavesSince x-rays have a minimum wavelength, their momentum will be maximum.A, B, D: These three options have greater wavelengths, hence lesser momentum than x-rays.
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
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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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