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PHYSICS CHAP1

QuestionAnswer
WHT TYPE OF RADATION IS GAMMA RADIATION IS... EM RADIATION EMITTED BY UNSTABLE NUCLEUS .NO MASS AND NO CHARGE.IT IS EMITTED BY A NUCLEUS WITH TOO MUCH ENERGY FOLLOWING ALPHA AND BETA EMISSION.
WHN DOES GAMA REDATION OCCUR... AFTER BETA AND ALPHA RAD.COZ NUCLEUS HAS TOO MUCH ENREGY.
WHAT IS THE CHARGE OF GAMMA RADIATION .... NO CHANGE NO MASS.
A VERY ELUSIVE PARTICLE:WHEN THE ENERGY SPECTRUM OF BETA PARTICLE MEASURED IT WAS DISCOVERED THAT....
BETA PARTICLES RELEASED KINETIC ENERGIES UP TO A MAXIMUM THAT DEPENDS ON THE ISOTOPE.
WHAT WAS THE MYSTERY ... EITHER ENERGY WASN'T; CONSERVED IN THE CHARGE OR SOME CARRIED AWAY BY NEUTRINOS AND ANTINEUTRINOS.
ANTINEUTRINOS WHERE DETECTED AS A RESULT OF.... ITS INTERACTION WITH CADMIUM NUCLEI IN LARGE TANK OF WATER.
WHAT PARTICLES SEEP THROUGH OUR BODIES FROM THE SUN... THE ELUSIVE PARTICLE THE NUETRINO
WHTA EM WAVECAN WE SEE. LIGHT WE CAN ONLY SEE LIGHT . OUR EYES CANNOT DETECT THE REST.
ALL EM RADIATION TRAVEL AT ... SAME SPEED OF LIGHT IN A VACUUM. 1.0 X108MS-1.
SPEED OF WAVE.... = WAVELENGTH AND FREQUENCY.
WE EXPRESSED LIGHT WAVELENGTH IN UNITS ... NANOMETRES.
EM WAVE CONSIST OF.... ELECTRIC AND MAGNETIC FEILD WHICH TRAVEL TOGETHER AND VIBRATE: TO RIGHT ANGLE TO EACH OTHER AND IN THE DIRECTION THEY ARE TRAVELLING.
WHT PHASE ARE ELECTRIC AND MAG WAVES IN... IN PHASE WITH EACH OTHER.- SO YOU CAN SEE WHERE THEY REACH A PEAK TOGETHER.(IN PHASE)
EM WAVES ARE EMITTED BY..... CHARGE PARTICLE WHEN IT LOSES ENERGY.
WHEN CAN EM WAVES BE EMMITTED ... WHEN FAST MOVING ELECTRON IS STOPPED ( E.G.. IN X RAY TUBE ) OR SLOW DOWN OR CHANGED DIRECTION. AN ELECTRON IN SHELL OF ATOM MOVES TO DIFF SHELL OF LOWER ENERGY.
EACH BURST IN EM WAVES LEAVE THE SOURCE IN... DIFF DIRECTION. EACH BURST IS A PACKET OF EM WAVES CALLED PHOTON.
WHAT DO EM WAVES EMITT IN DIF DIRECTIONS ... PHOTONS.
WHAT IS A PHOTON ... A PACKET OF WAVES.
THE PHOTON THEORY WAS ESTABLISHED BY/IN/WHEN... EINSTEIN IN 1905 WHEN EXPLAINING PHOTOELECTRICITY.
WHAT IS PHOTOELCTRICITY/FROM/WHEN... EMISSION OF ELECTRONS FROM A METAL SURFACE WHEN LIGHT DIRECTED AT SURFACE.
EINSTEIN IMAGINE PHOTONS TO BE LIKE ... FLYING NEEDLES.
PHOTON ENERGY EQUATION ... =HF H IS THE PLANCK CONSTANT 6.63 X10^-34JS.
LASER BEAM CONSIST OF PHOTONS OF ... THE SAME FREQUENCY.
THE POWER OF A LASER BEAM IS THE/BY /E.G... THE ENERGY PER SECOND TRANSFERRED BY THE PHOTONS. E.G. POWER OF THE BEAM =NHF. WHERE N IS THE NUMBER OF PHOTON PASSING A FIXED POINT EACH SEC.
THIS IS COZ EACH PHOTON HAS ENERGY HF.
POWER OF A BEAM EQUATION ... NHF
WHTA MAKES UP OUR UNIVERSE... ANTIMATTER AND MATTER MAKE UP OUR UNIVERSE.
WHEN ANTIMATTER AND MATTER MEET THEY/RELEASE... DESTROY EACH OTHER AND RADIATION IS RELEASED.
THE P IN PET SCANNER STANBDS FOR.... POSITRON WHICH IS A ANTIPARTICLE OF AN ELECTRON.
WHAT IS A POSITRON ... AN ANTIPARTCICLE OF AND ELECTRON. HAS POSITIVE CHARGE.
WHEN A PET SCANNER IS USED FOR BRAIN SCAN A P ... A POSITRON EMITTING ISOTOPE IS ADMINISTERED TO PATIENT
AND SOME OF IT REACHES THE BRAIN VIA BLOOD SYSTEM.
EACH POSITRON EMITTED TRAVELS NO FURTHER THAN.... A FEW MILOMETERS BEFORE IT MEETS AN ELECTRON AND THEY ANNIHILATE EACH OTEHR.
Created by: ufuoma
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