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 × 1 0 J in kiloelectron volts?

Q2:

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

  • A 4 . 4 6 × 1 0 J
  • B 2 . 2 9 × 1 0 J
  • C 8 . 7 5 × 1 0 J
  • D 2 . 2 4 × 1 0 J
  • E 1 . 1 4 × 1 0 J

Q3:

What is 30 keV in joules?

  • A 4 . 8 × 1 0 J
  • B 5 . 3 × 1 0 J
  • C 4 . 8 × 1 0 J
  • D 0.030 J
  • E 5 . 3 × 1 0 J

Q4:

What is 8 × 1 0 J in electron volts?

Q5:

How many electron volts are in 1 keV?

Q6:

What is 4 . 0 0 × 1 0 J in megaelectron volts ?

Q7:

How many electron volts are in 1 MeV?

  • A 1 0
  • B 1 0
  • C 1 0
  • D 1 0
  • E 1 0

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?

  • A 5 . 8 1 × 1 0 J
  • B 1 . 4 9 × 1 0 J
  • C 930 J
  • D 5 . 8 1 × 1 0 J
  • E 1 . 4 9 × 1 0 J

Q10:

How many giga-electron volts are there in 1 J? Use a value of 1 . 6 0 × 1 0 C for the charge of one electron.

  • A 6 . 2 5 × 1 0 GeV
  • B 1 . 6 0 × 1 0 GeV
  • C 6 . 2 5 × 1 0 GeV
  • D 1 . 6 0 × 1 0 GeV
  • E 1 . 6 0 × 1 0 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 . 6 0 × 1 0 C for the charge of an electron.

  • A 3 . 1 0 × 1 0 J
  • B 8 . 0 0 × 1 0 J
  • C 1.00 J
  • D 1 . 6 0 × 1 0 J
  • E 6 . 3 0 × 1 0 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?

  • A 1 . 9 0 × 1 0 eV
  • B 1.00 eV
  • C 3 . 9 0 × 1 0 eV
  • D 6 . 2 5 × 1 0 eV
  • E 0.500 eV

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