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Useful Constants

  • speed of light (c) = 3.0 x 108 m/s

  • Planck's Constant (h) = 6.626 x 10-34 Joules second

  • Charge of an electron (q) = 1.602 x 10-19 coulombs

Useful Units

  • frequency = cycles/second (Hz)

  • wavelength = length (m)

  • volt = a unit of potential of electric field, such that that it takes 1 Joule to push a charge of 1 Coulomb across 1 volt

Conversion Factors

  • 1 angstrom (A) = 1 x 10-10 meters (often used for the optical region of the spectrum)

  • 1 KeV = 1,000 eV = 1.6 x 10-16 Joules

Imagine the Universe is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center.

The Imagine Team
Acting Project Leader: Dr. Barbara Mattson
All material on this site has been created and updated between 1997-2012.

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