Definitions and Principles and that Flashcards
(40 cards)
Compare scalar and vector quantities. [2]
scalar and vector have magnitude
vector has direction
State what is represented by the area under a velocity–time graph. [1]
displacement
State the principle of superposition. [2]
when two or more waves meet
resultant displacement is the sum of the individual displacements
The results of the α-particle scattering experiment led to the development of the nuclear model for the atom.
State the results that suggested that most of the mass of the atom is concentrated in a very small region and most of the atom is empty space. [2]
a small proportion of particles are deflected through large angles
a large proportion of particles pass straight through
State the composition of γ-radiation. [1]
electromagnetic wave
State what is meant by the diffraction of a wave. [2]
wave passes through an aperture
wave spreads
State the conditions for a system to be in equilibrium. [2]
resultant force is zero
resultant moment is zero
State the relationship between amplitude A and intensity I for a progressive wave. [1]
I is directly proportional to A^2
State Ohm’s law. [2]
current is directly proportional to potential difference
provided that temperature remains constant
State the name of the group (class) of fundamental particles to which the positron and neutrino belong. [1]
leptons
Define power. [1]
work done per unit time
State Newton’s second law of motion. [1]
force is proportional to the rate of change of momentum
State Newton’s first law of motion. [1]
an object will remain at rest or in uniform motion unless acted upon by a resultant force
State Newton’s third law of motion. [1]
if two bodies interact, they exert equal and opposite forces on each other
State what is meant by coherent. [1]
constant phase difference
Define pressure. [1]
force / area
State what is meant by the centre of gravity of an object. [1]
the point where the weight is taken to act
Define force. [1]
rate of change of momentum
State the name of the law that gives the relationship between the force and the extension. [1]
Hooke’s
State the principle of conservation of momentum. [2]
total momentum before = total momentum after
if no external force
For a progressive wave, state what is meant by the frequency. [1]
the number of wavefronts passing a fixed point per unit time
Define the Young modulus. [1]
stress / strain
Define the potential difference across a component. [1]
energy per unit charge
State what is meant by precise. [1]
the measurements have a small range
