Which of the four fundamental forces is the strongest?

Gravity Electromagnetism The strong nuclear force The weak nuclear force

Which force is responsible for holding electrons in their orbits around nuclei and for all chemical bonding?

Gravity — it acts on the mass of the electrons The strong nuclear force — it extends from the nucleus outward Electromagnetism — the attractive force between the negatively charged electrons and the positively charged nucleus The weak nuclear force — it mediates all interactions involving electrons

The weak nuclear force is responsible for which process?

Holding electrons in their atomic orbits Radioactive beta decay — converting a neutron into a proton (or vice versa) with emission of an electron or positron Binding protons and neutrons together in the nucleus Causing alpha particle emission from heavy nuclei

Gravity is the weakest of the four forces by far — about 10³⁶ times weaker than electromagnetism. Yet gravity governs the large-scale structure of the universe. Why?

Gravity speeds up over large distances, becoming stronger than the other forces Gravity has infinite range and is always attractive — large objects are electrically neutral so charges cancel, but gravity never cancels The other forces stop working outside the Earth's atmosphere Gravity is actually stronger than electromagnetism — this is a common misconception

Which two fundamental forces have been successfully unified into a single theory?

Gravity and electromagnetism The strong and weak nuclear forces Electromagnetism and the weak nuclear force — unified into the electroweak force Gravity and the strong nuclear force

The strong nuclear force has a very short range — about 10⁻¹⁵ m (the size of a nucleus). What happens beyond this range?

The strong force becomes repulsive, like a rubber band snapping back The strong force drops off rapidly to essentially zero — it has no effect outside the nucleus It merges with gravity and becomes a combined force It reverses direction and becomes the weak force

Why can large nuclei (like uranium-238 with 92 protons) be unstable even though the strong force is much stronger than the electromagnetic repulsion between protons?

The strong force weakens when more neutrons are present in the nucleus The strong force only acts between adjacent nucleons; in large nuclei, electromagnetic repulsion acts across the whole nucleus and can overcome the short-range strong force Large nuclei contain too many electrons, which repel the strong force The strong force is weaker in heavier elements due to their greater mass

Each fundamental force is mediated by exchange particles (force-carrying bosons). Which particle carries the electromagnetic force?

The gluon The photon The W boson The graviton

What is a 'Theory of Everything' and why is it one of physics' greatest open goals?

A theory that explains everything that has ever happened, including history A single framework that unifies all four fundamental forces — currently, quantum field theory describes three forces but gravity remains incompatible A completed theory that scientists have already achieved — it's called the Standard Model A theory that describes all possible chemical reactions using one equation

If the strong nuclear force suddenly stopped working, what would happen?

Electrons would fall into the nucleus and atoms would collapse All atomic nuclei (except hydrogen-1) would instantly fly apart — protons would repel each other and all matter would disintegrate Atoms would become more stable because repulsive forces would no longer compete Only radioactive elements would be affected — stable nuclei would survive