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Technology Devices to overcome limitations
Transcript of Technology Devices to overcome limitations
Prepared by Woh Chee Leong
Presented by Woh Chee Leong, Norman Ng, Lim Zhi Wei, Loke Kok Leong
(from 2 Sigma SMKBJ) Technology Devices To Overcome Limitations of Sight And Hearing Devices that overcome limitation of hearing Devices that can overcome the limitation of sight Sight limitations
Without any devices , our sight and hearing was limited .
Limitations of sight can be overcome by using appropriate optical devices such as Microscope , Telescope and others. The objectives of learning about the limitation of sight and hearing :-
-We have learned that our hearing and sight has its limitation.
-We have learned that we are able to overcome the limitation of our sight and hearing by using or wearing technology devices.
-The technology devices have make our live easier :-
i)Doctors use stethoscopes to hear our heartbeats.
ii)Scientist use microscope to examine new cells. - to see far - objects like stars and planets.
- the first known practical telescopes were invented in Netherlands.
- an instruments that aids in the observation of remote objects by collecting electromagnetic radiation. Hearing Limitations
The range of frequency of hearing in human is 20 Hz and 20 000 Hz . It was different according to the age of a person ( Children -larger range of hearing frequency than adults ) . Hearing limitations can be overcome by using appropriate hearing aids such as stethoscope , megaphone , microphone , earphone , headphone , PA System and others. All of these devices helps us to makes our live easier. INTRODUCTION Telescope Microscope - To see object that are too small for the naked eye.- Invented by Zacharias Jansson .- Optical microscope ( the first invented ) , have one / more lenses that are refractive glass and occasionally of plastic to focus light into the eye or another light detector. Periscope - to see a view beyond and obstructing object.-an instrument for observation from a concealed position.- consists of an outer case with mirrors at each end set parallel to each other at 45 degree angle. Objective -helps doctors to detect the soft heartbeats of patients.-invented in France by Rene Laennec Stethoscope - boosts weak sounds ( the function of Megaphone as same as Microphone )- invented by Samuel Morland and Athanasius Kircher. Megaphone - collects and amplifies sounds before sending them to the middle ear .- invented by Nathaniel Baldwin. Earphone Conclusion The limitations of sight and hearing can be overcome by using certain devices. THE END Thank you for watching