Physics Test A Flashcards
What are the characteristics of ideal fluids
no viscosity, no turbulence and are incompressible.
young modulus
pressure (stress)/ Length (strain)
what happens to light when it passes from one medium to another?
its frequency remains the same and its wavelength changes.
define current
current is the movement of a charge between two points with different electric potentials.
eletron volt (eV)
represents the energy acquired by an electron accelerating through a potential difference of 1 volt.
Instantaneous Velocity definition
slope of the graph of the objects position with respect to time at the particular time T.
Newtons 1st law
An object at rest remains at rest unless acted on by a net force, an object in motion remains in motion with constant velocity unless acted on by a net force
Newtons 2nd Law
a net force applied to a body of mass m will result in that body undergoing an acceleration the same direction as the net force. F=ma
Newtons 3rd Law
If body A exerts a force F on body B, then B exerts a force -F back on A (equal in magnitude opposite in direction)
Archimedes Principle
deals with law of buoyancy.
Pascal’s principle
when pressure is applied to a fluid in a sealed container it is evenly distributed
whats fission
process in which a nucleus splits into two or more nuclei each having a smaller mass number than the original.
The fission process is a means by which a least stable nuclei (less energy binding per nucleon) becomes more stable ( more energy binding per nucleon)
what makes a more stable element?
The most stable element is also the element with the highest energy binding per nucleon.
fussion
two or more nuclei fuse together to form a new nuclei, the mass number of the resulting nuclei is bigger than the two fused ones.
How does a standing wave occur for a tube closed at one end and open at the other?
a standing wave results when the wavelength is such that the closed end is a node and the open end is an antinode.
what does the condition of resonance depend on?
Depends on the length of the tube and the wavelength of the wave
elastic collision
the kinetic energy of the system before the collision equals the kinetic energy after the collision.
For all types of collision momentum is conserved.
what is dispersion
dispersion is the variation of wave-speed with frequency in a medium; the separation of visible light into its constituent colors as a result of this variation.
what is diffraction
diffraction is the bending off waves as a result of passing through a slit; the bending of waves around an obstacle.
what is reflection
reflection is the change in direction of a wave at the boundary of a medium when the wave remains in the medium.
what is polarization
polarization is the processes whereby all the electric field vectors of light are made parallel.
what is the idea of the photoelectric effect
the idea is that electrons will be ejected from a metallic surface when the light of sufficient frequency is shone on the surface. From planks equation (E=hf) , the frequency of the light determines the energy. The electrons on the surface require a small energy called the work function in order for it to be liberated from the surface. The frequency of the light must be large enough so that the lights energy is at least as the work function or no electron will be emitted.
what is heat convection?
convection is the transfer of energy to a region by the movement of a mass of heated material, as in rising hot air.
what is heat radiation?
the process of energy transfer via electromagnetic waves.
