Worksheet: The Electron Volt

In this worksheet, we will practice defining the unit of an electron volt and converting between electron volts and other energy units.

Q1:

What is 2×10 J in kilo-electron volts?

Q2:

What is 14 eV in joules? Give your answer to 3 significant figures.

  • A8.75×10 J
  • B1.14×10 J
  • C2.24×10 J
  • D2.29×10 J
  • E4.46×10 J

Q3:

What is 30 keV in joules?

  • A0.030 J
  • B4.8×10 J
  • C5.3×10 J
  • D5.3×10 J
  • E4.8×10 J

Q4:

What is 8×10 J in electron volts?

Q5:

How many electron volts are in 1 keV?

Q6:

What is 4.00×10 J in mega-electron volts ?

Q7:

How many electron volts are in 1 MeV?

  • A10
  • B10
  • C10
  • D10
  • E10

Q8:

An electron is accelerated across a potential difference of 7 V. The electron moves in a vacuum. What is the kinetic energy, in electron volts, of the electron once it has crossed this potential difference?

Q9:

What is 930 MeV in joules?

  • A1.49×10 J
  • B5.81×10 J
  • C5.81×10 J
  • D1.49×10 J
  • E930 J

Q10:

How many giga-electron volts are there in 1 J? Use a value of 1.60×10 C for the charge of one electron.

  • A1.60×10 GeV
  • B1.60×10 GeV
  • C6.25×10 GeV
  • D6.25×10 GeV
  • E1.60×10 GeV

Q11:

An electron is accelerated across a potential difference of exactly 1 V. The electron moves in a vacuum.

What is the kinetic energy, in joules, of the electron once it has crossed this potential difference? Use a value of 1.60×10C for the charge of an electron.

  • A8.00×10 J
  • B6.30×10 J
  • C3.10×10 J
  • D1.60×10 J
  • E1.00 J

If this value of energy is used as a unit (electron volt, eV), what is the kinetic energy of the electron once it has crossed the potential difference, in electron volts?

  • A1.90×10 eV
  • B3.90×10 eV
  • C1.00 eV
  • D6.25×10 eV
  • E0.500 eV

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