Intro, Units & Conversions Video Lessons

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Problem: A. In SI units, 1 volt = 1 Joule/Coulomb. If an electron-volt (eV) is equal to the energy of 1 electron moved through a potential difference of 1 volt, how many joules is this? (Hint: what is the charge of one electron?)B. A terahertz (THz) is 1012 hertz (Hz), and 1 Hz = 1 s–1. How many joule-seconds is 1 eV/THz?C. Express Planck's constant h in units of eV/THz.D. Express the number (0.5 eV)/(100 THz) in J-s.

FREE Expert Solution

A.

1V = 1J/C

1eV=(1.6×10-19C)(1V)=1.6×10-19C·V(1J/C1V)=1.6 ×10-19 J

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Problem Details

A. In SI units, 1 volt = 1 Joule/Coulomb. If an electron-volt (eV) is equal to the energy of 1 electron moved through a potential difference of 1 volt, how many joules is this? (Hint: what is the charge of one electron?)

B. A terahertz (THz) is 1012 hertz (Hz), and 1 Hz = 1 s–1. How many joule-seconds is 1 eV/THz?

C. Express Planck's constant h in units of eV/THz.

D. Express the number (0.5 eV)/(100 THz) in J-s.

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