Paper 1 Flashcards

Luminosity

The total radiant output power of a star

White dwarf

A very dense star formed from the core of a red giant, in which no fusion occurs

Doppler effect

Observed frequency is different to source frequency when source moves relative to observer.

Hubble’s law

Recessional speed / velocity of galaxy is proportional to its distance (from us)

Kepler 1

The orbit of a planet is an ellipse with the Sun at one of the two foci

Kepler 2

A line segment connecting a planet to the SUn sweeps out equal areas during equal intervals of time

Kepler 3

The square of the orbital period T is directly proportional to the cube of the average distance r to the sun

SHM

Oscillating motion for which the acceleration of the object is directly proportional to its displacement and in direction of the point of equilibrium

Gravitational potential

The work done per unit mass to bring an object from infinity to a point in the gravitational field

Ultimate tensile strength

The maximum stress that a material can withstand before it breaks

Newton 1

A body will remain at rest or at constant velocity unless acted upon by a resultant force

Newton 2

Resultant force is directly proportional to the rate of change of momentum

Newton 3

When two objects interact, each exerts an equal but opposite force on the other during the interaction

Latent heat

The energy required to change unit mass of a substance from ___ to ___ while at constant temperature

homogeneous

Uniform in terms of distribution of matter