Energy and Electron Volts Problems

This video tutorial explains electron volts as a unit of energy, comparing them to joules. It defines an electron volt as the energy gained by an electron or proton moving through a one-volt potential. The video demonstrates how to convert between electron volts and joules, using the charge of an electron. It provides examples of calculating energy gain in electron volts and solving problems involving energy conversion. The tutorial concludes with practical exercises to reinforce understanding of these concepts.

What is the primary use of electron volts in physics?

• To measure large amounts of energy

• To measure temperature

• To measure small amounts of energy

• To measure distance

How much energy in joules is equivalent to one electron volt?

• 1.60 x 10^-17 joules

• 1.60 x 10^-20 joules

• 1.60 x 10^-19 joules

• 1.60 x 10^-18 joules

If an electron passes through a region of 3 volts, how many electron volts of energy does it gain?

• 1 electron volt

• 2 electron volts

• 3 electron volts

• 4 electron volts

How many joules are in 250 electron volts?

• 4.0 x 10^-16 joules

• 4.0 x 10^-19 joules

• 4.0 x 10^-18 joules

• 4.0 x 10^-17 joules

What is the energy gained in electron volts when 25 electrons pass through 5 volts?

• 175 electron volts

• 150 electron volts

• 125 electron volts

• 100 electron volts

How many electron volts are equivalent to 2.6 x 10^-8 joules?

• 1.63 x 10^10 electron volts

• 1.63 x 10^11 electron volts

• 1.63 x 10^12 electron volts

• 1.63 x 10^9 electron volts

If 30 protons pass through 8 volts, how much energy do they gain in joules?

• 3.84 x 10^-16 joules

• 3.84 x 10^-18 joules

• 3.84 x 10^-19 joules

• 3.84 x 10^-17 joules

How many electrons are needed to gain 40 electron volts after passing through 8 volts?

• 7 electrons

• 5 electrons

• 6 electrons

• 4 electrons

Electrons gain 6.72 x 10^-18 joules after passing through 7 volts. How many electrons are there?

• 5 electrons

• 6 electrons

• 7 electrons

• 8 electrons

What is the conversion factor used to convert joules to electron volts?

• 1 electron volt over 1.6 x 10^-18 joules

• 1 electron volt over 1.6 x 10^-17 joules

• 1 electron volt over 1.6 x 10^-19 joules

• 1 electron volt over 1.6 x 10^-20 joules