Bab 1: Dunia Melalui Deria Kita
B6 D1 E1
Technological devices which are suitable for overcoming the limitations of sight and hearing
Microphone make sound louder and clearer .We often use it when we giving informations at busy and noisy place
Hearing aids can be defined as any devices that amplify the acoustic signal to a degree that enable individuals with hearing loss to use their remaining hearing in a use ful and efficient manner
Helps doctors to detect lung, stomach and the soft heartbeats of patients . The listener can hear normal and abnormal respiratory, cardiac, pleural, arterial, venous, uterine, fetal, and intestinal sounds.
To see far objects such as stars and planets. Besides that, it consists of two convex lenses ( eyepiece lens)
Provide stereoscopic vision of distant objects for seeing tiny object . A pair of identical telescope mounted side by beside in the same direction allowing the viewer to use both eyes when viewing distant objects.
Ultrasound scanning device
To scan and see the fetus a pregnant mother . Shaped like microphone is pressed against the area being scanned .It also send out very high frequency sound waves into the area being scanned.
Technological Devices To Overcome Limitations Of Sight
Instrument to magnify objects such as virus and cell .To see object that are too small to the naked eyes
To magnify tiny objects appear larger than the original shaped. The convex lens use to produce magnified image of an object .It also called a hand lens in lab context .The limited magnifying power -10 to 15 tim
X-rays can also be used to detect the condition of certain organs or detect of bones. In medical X-rays .The X-rays penetrate the internal soft body tissues and form images on a film which can be examined by a radiologist
Limitation of Sight & Hearing
Humans have sight and hearing...
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