# 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 J in kilo-electron volts?

Q2:

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

• A J
• B J
• C J
• D J
• E J

Q3:

What is 30 keV in joules?

• A0.030 J
• B J
• C J
• D J
• E J

Q4:

What is J in electron volts?

Q5:

How many electron volts are in 1 keV?

Q6:

What is J in mega-electron volts ?

Q7:

How many electron volts are in 1 MeV?

• A
• B
• C
• D
• E

Q8:

An electron is accelerated across a potential difference of 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 J
• B J
• C J
• D J
• E930 J

Q10:

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

• A GeV
• B GeV
• C GeV
• D GeV
• E GeV

Q11:

An electron is accelerated across a potential difference of exactly 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 for the charge of an electron.

• A J
• B J
• C J
• D 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?

• A eV
• B eV
• C1.00 eV
• D eV
• E0.500 eV