Physics Gr.10 T2 sound waves, electromagnetic radiation, magnetism, electrostatics Flashcards
What are longitudinal waves?
Particles in a medium oscillate in directions parallel to the direction that the wave is traveling.
What are sound waves?
Longitudinal waves that result from the vibration of objects (pressure waves).
What do sound waves travel best through?
Solids
Liquids
Gases
Solids
On what can sound waves be shown?
An oscilloscope
What is pitch?
How high or low a note is
What is loudness?
Amplitude is a measure of the pressure changes
What is the audible range?
20 Hz-20 000 Hz
What is a musical note?
Sound caused by regular vibrations
What is noise?
Irregular vibrations with a mixture of different frequencies.
What is ultrasound?
“Beyond” sound
Why does electromagnetic radiation have wave particle duality?
Sometimes behaves like a wave and sometimes behaves like a particle.
What is the origin of electromagnetic radiation?
Charges are accelerated and this causes alternating electric and magnetic fields, which form perpendicular to each other.
Which 3 elements are ferromagnetic materials?
Cobalt (Co)
Nickel (Ni)
Iron (Fe)
What is a magnetic field?
A region in the space around a magnet where other magnets will experience a force.
What causes magnetic storms?
The distortion of the earth’s magnetic field by solar winds of charged particles.
What causes auroras?
Charged particles in solar winds are trapped in the Earth’s field lines and collide with gases in the ionosphere, causing them to be energized and glow.
What is an insulator?
An object that is charged by rubbing. Charges accumulate on the surface. Charges are not free to move.
What is a conductor?
An object where charges are mobile.
What is polarisation?
To make charges on a neutral object separate by bringing a charged object closer.
What is the symbol and unit of electric charge?
Symbol: Q
Unit: C (coulomb)
What is the name of this formula?
Q+Q
1 2 Q=➖➖
2
Th law of conservation of charge.
What is the name of this formula?
Q=nq
e
the principle of quantisation
What is the magnitude of a charge?
-19
1,6x10 C
What is the law of electric charge?
The net charge of an isolated system remains constant during any physical process.
