# Lesson Worksheet: The Electron Volt Physics • 9th Grade

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 electron volts?

Q2:

How many electron volts are in 1 MeV?

• A
• B
• C
• D
• E

Q3:

How many electron volts are in 1 keV?

Q4:

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?

Q5:

What is J in mega-electron volts? Give your answer to one decimal place.

Q6:

What is J in kilo-electron volts?

Q7:

What is 30 keV in joules?

• A0.030 J
• B J
• C J
• D J
• E J

Q8:

What is 14 eV in joules? Give your answer in scientific notation to two decimal places.

• A J
• B J
• C J
• D J
• E J

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