Page 19 - [인성]2016+영자신문

Science 19

Interesting science

in everyday life

1-2 Kim Su-jeong, Mun Gyu-ri

1 Why attach wet newspaper on a 2

window to prepare for a typhoon?
Every object has resonance, resonance
is resonance by vibration and
resonance by sound. Typhoons have both wind
Why are you rubbing your vibration and sound resonance. As the window quiver
eyes when you are sleepy? in the wind, the vibration will come and the sound will
Children rubbing their eyes ring because of the vibration.
mean that they are sleepy. The glass is solid. People usually think that solids do
If so, why are they rubbing their eyes when they are not move because they are stationary. However, the
sleepy? solid has elasticity. The degree of elasticity is low, but
Once you start sleeping, your hands and feet become most objects have some bending properties. It is also
warm. This is because the blood is collected near the the glass. The relationship between resilience and
skin surface of the hands and feet, releasing heat in resonance is very close and less elastic, less impactful.
the blood and lowering the body temperature. In the Resonance will cause the object to vibrate, so if the
end, when you are asleep, your hands and feet warm elasticity is low, the object will not withstand the
temporarily because you need to control your resonance force and it will be destroyed. Wet
metabolism by lowering your body temperature so that newspaper holds this elasticity and resonance.
you do not use the remaining energy. When blood Precisely, it is seen that newspapers absorb some
accumulates in the skin around the eyes, the activity of vibration by attaching wet newspapers to the windows.
the lacrimal glands slows down and the production of
tears decreases. So you often blink your eyes and want
to rub it. That is, rubbing your eyes is the signal of the
body that it is time to sleep right now.

Why do you change your voice when you drink helium gas?
3 Duck" effect. To understand the cause of this phenomenon, we first need to understand how the voices are
The phenomenon in which the voice changes after drinking helium gas is commonly called the "Donald

generated. The voice is produced as the air from the lungs passes through the center of the vocal cords in
the lower neck and then goes out through the vocal passage. Due to the tension of the vocal cords, air
pressure is changed, and the air between them vibrates, resulting in various sounds. At this time, the
frequency of the sound determines the pitch of the voice and the person has a different voice through this
process. Another factor that changes the voice is the type of air in your mouth. When a person
speaks, air from the lung passes through the vocal passage and resonates in the mouth. At
this time, the speed of the sound in the mouth changes according to the density of the air in
the mouth, and as a result, the frequency changes. Therefore, if you speak in the presence
of helium in your mouth, the frequency of this sound is three times higher than that of
normal air, so your voice will be higher than usual.