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Technology Devices to overcome limitations

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by

Leon Woh

on 9 December 2013

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Transcript of Technology Devices to overcome limitations

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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
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