Accessibility options

Switch to preferred accessibility theme:


Increase or decrease the text size:

  • Internet Explorer: View > Text Size > Largest

Keyboard navigation and access keys:

  • A - Accessibility options
  • 0 - Skip navigation
  • 1 - Home
  • 2 - Alexandrite chapters
  • 3 - Alexandrite directory
  • 4 - Alexandrite forums
  • 5 - Alexandrite gemstones
  • 6 - Alexandrite localities
  • 7 - Contact information
  • 8 - About Alexandrite Guide
  • 9 - Sitemap
  • Press ALT + Access Key, then ENTER.

Close

Alexandrite

Tsarstone collectors guide


Quantum

Quantum
Quantum of light or electromagnetic radiation, it can behave as a wave or as a particle. Traveling at the velocity of light. Photon have momentum but not mass or electrical charge. Also known as light quantum. Caused by excitation of atoms and molecules and more energetic ones can cause ionization. A sample for a quantum: when one gram sand corn swinging as a pendulum, one swing per second and rising one cm during each swing which has an energy of about 0.0001 Joule, this swinging corn contains about 150 x 10(27) quanta of energy.

Be first to comment

600 characters left, NO HTML, Comments are moderated and will be posted if they are on-topic and not abusive.
Your e-mail will not be published, but must be valid. In order to reduce the amount of spam, we will send you an email message containing a link to confirm your comments publication. Unconfirmed comments will be not published and removed from our system within 3 days.
Please help us to prevent automated requests by entering the code shown in the picture box. Can´t read this image? Get new verification code
Close options details