<u>Braille is a system of raised dots that can be read with the fingers by people who are blind and they can recognize the dots by their fingers which have touch receptors.</u>
<h2>Explanation:</h2>
Sensory receptors perform various functions in our bodies. During vision, photo receptors respond to light intensity and color, but those people who are blind do not have functional photo receptors that is why they use their touch sense to recognize letters and words for reading. The technique is called braille system. Braille symbols are formed within units of space known as braille cells. A full braille cell consists of six raised dots arranged in two parallel rows each having three dots. These dots are touched by fingers and touch sensors in fingers take signals to the brain which takes no time to respond and hence the letters are recognized by the reader.
Human fingers are so sensitive because they are highly innervated with sensory receptors. The body is arranged so that areas requiring discriminative touch have more nerve receptors.
Human fingers have glabrous skin or skin without hair. Within glabrous skin, there are specific receptors that may differ from hairy skin. The specific receptor in the finger tips that allows for discriminative touch are called <em>Meissner's Corpuscles</em>.
When balanced forces act on an object at rest, the object will not move. If you push against a wall, the wall pushes back with an equal but opposite force. Neither you nor the wall will move. Forces that cause a change in the motion of an object are unbalanced forces.
Radio waves are used for communications and radar. Microwaves are used to cook your food. Infrared waves are used in remote controls and are emitted from all warm objects, allowing them to be used to create heat-sensitive cameras.
Explanation:
Basically electromagnetic waves can be found in your everyday life.
The Doppler red-shift of light observed from distant stars and galaxies gives evidence that the universe is expanding (moving away from a central point). This allows for Big Bang Theory, because after a “bang” occurs all of the matter moves away from the point of origin.
