Think you know Physics?

Sample Physics questions

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   What job did Albert Einstein have when he created E=mc²?

   Answer: Patent clerk

   Why: Einstein was a technical expert third class at the Bern patent office; the mass energy paper reached Annalen der Physik in September 1905.

2. 2 Medium

   Why can nothing travel faster than light in vacuum?

   Answer: Einstein's relativity makes it universe speed limit.

   Why: Pushing any mass to that speed would take infinite energy. Since 1983 the metre is even defined by it: exactly 299,792,458 m/s in vacuum.

3. 3 Hard

   Which subatomic particle has the smallest known non-zero mass?

   Answer: neutrino

   Why: Oscillations prove neutrinos have mass, yet none has been weighed: KATRIN only caps it under 0.45 eV, less than a millionth of the electron's.

4. 4 Easy

   Why do ears pop during airplane takeoff and landing?

   Answer: Pressure imbalance between middle ear and cabin air.

   Why: The pop is your Eustachian tube opening to equalize. Cabin air sits near 6,000 to 8,000 feet of altitude, so swallowing or yawning speeds it up.

5. 5 Medium

   What did Michelson-Morley experiment disprove in physics?

   Answer: Luminiferous ether

   Why: In 1887 they floated the interferometer on mercury and found no ether wind. Michelson became the first American to win a science Nobel.

6. 6 Hard

   What is the minimum energy required to remove an electron from a metal?

   Answer: work function

   Why: The work function is a property of the surface, not the bulk: caesium frees electrons at about 2.1 eV, platinum needs roughly 5.6 eV.