Human performance
Classified in Physics
Written at on 
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LIGHT AND SOUND ARE WAVES= LIGHT WHEN IT IS REFLECTED FROM OBJECTS AND WHEN IT REACHES OUR EYES ALLOWS US TO SEE
SOUND=MAKES THE EARDRUM, A MEMBRANE IN EAR,VIBRATE THE VIBRATIONS OF THE EARDRUM ARE TRANSMITTED TO THE BRAIN BY NERVES
HOW IS LIGHT PRODUCED
THE SUN IS THE MAIN OF SOURCE OF LIGHT ON THE EARTH
WE HAVE ALSO LEARNT HOW TO PRODUCE LIGHT
USING ELECTRICAL ENERGY=THIS IS THE CASE WITH LAMPS,TELEVISION OR COMPUTER SCREEN
HOW SOUND IS PRODUCED
INTENSITY=SOUNDS CAN BE STRONG OR WEAK SOUND IS THE MAGNITUDE WHICH VARIES WHM WE REGULATE THE VOLUME,THE LEVEL OF INTENSITY OF SOUND IS MEASURED UN DECIBELS
THE TONE=SOUNDCAN BE HIGH OR LOW.THE TONE IS THE CHARACTERISTIC WHICH DIFFRENTIATES TWO MUSICAL NOTES WITH SAME INTENSITY PRODUCED BY INSTRUMENT
THE QUALITY OF SOUND CORRESPONDS TO A MAGNITUDE WHICH IS KNOW AS THE FRECUENCY AND IS MEASURED IN HERTZ
ULTRASONIC AND CAN BE HEARD BY SOME ANIMALS SUCH AS DOG DOLPHINS OR BATS
LENSES REFRACT LIGHT=THE PHENOMENON OF THE REFRACTION OF LIGHT IS USED IN LENSES A LENS IS A DISC OF GLASS OR PLASTIC WHITH ONE OR TWO CURVED FACES
COVERING LENSES=ARE THICKER IN THE CENTRE THAN AT THE EDGES
DIVERGING LENSES =ARE THICKER AT TH EDGES THAN AT THE CENTRE
THE SPEED OF SOUND=THE SPEED OF SOUND TRANSMISSION DEPENDS ON THE MEDIUM IN WHICH THE SOUND WAVES ARE BEING TRANSMITTED
IN AIR THE SPEED OF SOUND IS 340M/SEC
IN WATER TH SPEED OF SOUND IS HIGHER:1500M/SEC
IN SOME SOLIDS SUCH AS IRON, THE SPEED OF SOUND CAN REACH 6000M/SEC
SONAR IS ANOTHER SYSTEN THAT USES THE REFLECTION OF SOUND TO DETECTS OBJECTS
ECHOES IS PRODUCED WHEN THE SOUND REFLECTED BY AN SITUADES
REVERBATION HEAR SOUND IN A MIXED UP WAY WHICH MAKES IT DIFFICULT FOR US TO UNDERTAND THEM
EYES IS PROTECTED BY TWO MEMBRANES THE SCLERA AND CORNEA
SCLERA
CORNEA
PUPIL
IRIS
LENS
RETINA
OCULAR MUSCLE
OPTIC NERVE
THE HUMAN EAR HAS THREE PARTS THE OUTER EAR,THE MIDDLE EAR,THE INNER EAR
HOW DOES THE EAR WORK :THE FUNTION OS EAR IS TO CAPTURE SOUND.AS SOUND ARE VIBRATION,THE EAR MUST BE CAPABLE OF CAPTURING AND TRANSMITING THESE VIBRATION