Assessment: Modern Physics
Answer every question, then submit to see your score and which topics to review.
Part A — Concept Questions
A radioactive sample has a half-life of 5 years. Find the percentage remaining after 15 years.
MediumA nuclear reaction converts 0.0002 kg of mass into energy. Find the energy released.
EasyPart B — Formula & Application
A proton (mass 1.67 times 10 to the power -27 kg) moves at 3 times 10 to the power 5 m/s. Find its de Broglie wavelength.
HardFind the Lorentz factor (gamma) for an object moving at 0.6c.
MediumPart C — Problem Solving
A radioactive sample decays to 1/16 of its original amount. How many half-lives have passed?
MediumHow much mass must be converted to release 3.6 times 10 to the power 14 J of energy?
HardPart D — Real-Life Application
Why can electron microscopes image details far smaller than light microscopes can?
MediumWhy must GPS satellite clocks be corrected using special relativity?
MediumPart E — Challenge
A radioactive sample starts with 800 atoms and decays to 50 atoms. If the half-life is 3 hours, how many hours have passed?
HardA muon travels at a speed such that its Lorentz factor gamma equals 10. Find v/c.
Hard0/10 answered