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Science Band 6(athira)

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Athira Yusri

on 10 March 2013

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Transcript of Science Band 6(athira)

1.7 Light & Sight
1.8 Sound & Hearing THE WORLD THROUGH OUR SENSES Introduction Reflection of light occurs when light bounces off the surface of an object. The bending of light ray when it enters a medium of different dencity is known as the refraction of light. BINOCULARS - To see tiny distant objects such as birds in the sky.
- Invented in 1825 by J.P. Lemiere.
- A pair of identical or mirror-symmetrical telescope mounted
side by side and alignedto point accurately in the same
direction allowing the viewer to use both eyes when viewing
distant object. Sounds are produced by vibrations. Sounds needs a medium to travel. Sound can travel through solids, liquids and gasses. Sound cannot travel through a vacuum. Hard and smooth surfaces like walls are good reflector of sound. Soft and rough surfaces like curtains are good absorbers of sound. Reflected sound are called echo. Humans have sight and hearing limitation, Without any devices, our sight and hearing was limited. Limitation of sight can be overcome by using appropriate optical devices such as microscope, telescope and others. The range of frequency of hearing in human is 20 Hz and 20000 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 hels us to
makes our live easier. Objective The objectives of learning about the limitation of sight and hearing :-
- We have learnt that our hearing and sight has its limitation.
- We have learnt that we van 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 stethoscope to hear our heartbeats.
(ii) Teachers use microphone in the assembly. - To see object that are too small for the naked eye.
_ Invented in 1625 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. - To see far-off objects such as stars and planets.
- Invented in 1605 by Hans Lippershey.
- The first known practical telescopes were invented in
- An instrumentent that aids in the observation of
remote objects by collecting electromagnetic radiation.
The Technology Devices Used To Overcome The Limitation Of Sight & Hearing MICROSCOPE TELESCOPE - To make tiny objects appear larger than the original.
- Invented by Roger Bacon.
- Convex lens that is used to produce a magnified
image of an object.
- Also called a hand lens in a laboratory contexts. Group Members - Athira Zuhaira bt. Ahmad Yusri
- Barbara Hoi Wheei Yii
- Marsya Nur Liyana bt. Malik Faishal
- Nur Qamarina bt. Mohd. Zamri
- Invented in
- A cyclic sound pressure wave with frequency greather
than the upper limit of the human hearing range. - To see a view beyond and obstracting object.
- Invented in
- An instrument for observation from a concealed
- Consists of an outer case with mirrors at each other
at 45 degree angle. - To see the internal organs or to inspect baggages at the
_ Invented in 1895 by Wilhelm Conrad Rontgen.
- These devices are commonly used by radiographers. - Helps doctors to detect soft heartbeats of patients.
- Invented in 1816 by Rene Laennec at the
Necker-Enfants Malades Hospital in Paris, France.
- It is an acoustic medical for auscultation, or listening to
the internal sounds of an animal or human body. - Boosts weak sounds and increases the volume of
- Invented in 1655 by Samuel Morland and Athanasius
Kircher. - Collects and amplifies sounds before sending
them to the middle ear.
- Invented by Nathaniel Baldwin. - Amplifies voices so that they can be heared
from far away.
- Invented by Edwin Jensen and Peter Pridham.
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