Jump to content

Is Light's Phase Velocity Always C?

Muon321
in Quantum Theory

Featured Replies

If it is not always c, then λf=c would be incorrect, and it should be λf=v_p like matter waves, right?

Phase velocity is [math]v_{p}=E/p[/math], and group velocity is [math]v_{g}=\partial E/\partial p[/math]. For light, [math]E=pc[/math], so [math]v_p = v_g = c[/math].

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.

Configure browser push notifications
Chrome (Android)
  1. Tap the lock icon next to the address bar.
  2. Tap Permissions → Notifications.
  3. Adjust your preference.
Chrome (Desktop)
  1. Click the padlock icon in the address bar.
  2. Select Site settings.
  3. Find Notifications and adjust your preference.