Low Markers and Definitions (Physics) Flashcards
What are the conditions for Simple Harmonic Motion [2 marks]
acceleration is proportional to displacement
AND
acceleration is always acting in an opposite direction to displacement
What does Gradational Field Lines show?
The directions of a force acting on a mass
Define Activity of a radioactive isotope:
the number nuclei of the isotope that disintegrate per second
Define Amplitude:
The maximum displacement from equilibrium of an oscillating object
What happens during annihilation?
the collision of a particle and its respective anti-particle causes them to both destruct and become radiation
What is the value, unit and definition of Avogadro’s constant?
6.02 x 10^23 mol^0-1
the number of atoms in 12g of carbon isotope.
What is background radiation?
radiation caused naturally by radioactive substances in the environment
What is specific latent heat of fusion?
the energy required to change 1Kg of material from thew solid to liquid state at the melting point
Define electric field strength at a point in an electric field?
the force per unit charge on a positive charge
State Lenz Law:
the induced EMF is such that it will try to pose the cane that produced it
What is modal dispersion in optical fibres?
Pulse broadening through the wire due to entering the wire at different angles
what is a progressive wave?
a wave that can transfer energy from one point to another without transferring medium
