3 ms·

I don't understand that, given that momentum is mass times velocity. Can you explain?

• jameshart 3y ago
  For a photon, momentum is (edit) the inverse of its wavelength, times the Planck constant. I appreciate that this is not really an ‘explanation’.
  • mercutio2 3y ago
    Momentum is proportional to frequency. Inversely proportional to wavelength.
    • jameshart 3y ago
      Thanks - corrected
• mercutio2 3y ago
  Non-relativistic momentum is (simplified to) mass times velocity. Photons have zero mass, but still have momentum, p=h/λ.
• denton-scratch 3y ago
  Mass == energy.