Science News.
Guadalupe Rubí Arteaga Martínez.
N.L:1
Dennmark.
Physics Around Us.
Possible Experiments.
Science News.
Objective:
Demonstrate that a vibration and sound is transmitted through air and of other bodies.
Materials Needed for Experiment
* Two glasses of Cristal
* Two matches
Procedure of Experiment
Take two glasses and place them next to each other. Place the two matches supported
at the peak of one of the cups. Now dip the tip of one of your fingers with water and
begins to walk the edge of the other glass, as shown in the video.
https://www.youtube.com/watch?feature=player_embedded&v=OzERAYFcI9U
How does the experiment work?
The sound is nothing but an elastic wave propagation. So that it can be propagated,
there must be a fluid. In this case, the fluid is air. If instead we would be in space, where
there are "empty", the sound would not spread.
How I can see sound?
This is a very simple experiment that can be performed in the classroom in order to
make sound waves that cause environmental disturbance and activate our sense of
hearing visible. To conduct this experiment we need:
- Scissors
- Globe
- Adhesive Quote
- Glue
- Very small mirror
- Lamp
- A cardboard tube or a can
Instructions:
- Cut the globe to cover one of the holes in the tube, hold it tightly with tape so that it is
taut.
- Glue the small mirror on the shore of the globe which is taut (if you are in the middle
will not work properly).
- Emits any sound on the other side of the tube, while another or other person shining a
lamp or flashlight mirror diagonally, not straight (preferably to be in a place with low
light).
- The lamp light will be reflected by the mirror into a dark cardboard or black wall.
The phenomenon that occurs is that the voice creates vibrations in the air and on the
tube, which has in turn causes the balloon and the vibrating mirror. The moving light
that can be seen are the vibrations of the voice.
In the air it can be interpreted as pressure changes occurring at high speed. Within
solids, it occurs because of variations in the state of tension.
By rubbing the finger, the same glass begins to vibrate. The sound is transmitted
through the air and makes the other cup vibrate. Such vibration is allowing matches to
move because its friction coefficient becomes almost zero by high frequencies.
Science News.
All the time we hear sounds and noise, but do you ever wonder how it happens? Today
we will see some spectacular experiments with sound, that will leave you surprised
safe. We achieve virtually isolate the sound of an alarm clock when placed in a hood
and removing the air inside.
Materials:
* Vaseline
* A bell jar (see video)
* Hoses
* A cork
* A sponge
* Alarm Clock
* Vacuum Pump (insurance are in your school laboratory)
Procedure:
I'll make a general explanation because not all get the same materials. Well, the main
objective is to ensure that within the bell jar is empty (correctly would be: lower than
atmospheric pressure). That's why watching the video, and taking into account the
materials that you get in your school laboratory, you have to assemble the device.
Vaseline is just to make a tight seal and that no air inside the bell, while the vacuum
pump is responsible for "pull" the air inside of said hood.
Set your clock to ring some minutes later, so you have time to generate the "empty"
inside the bell.
APA
1. Rolando Delgado Castillo, Francisco A. Ruiz Martínez (Universidad de
Cienfuegos). «De Aristóteles a Ptolomeo». Archivado desde el original el 12 de
enero de 2005. Consultado el 29 de enero de 2008.
2. Rolando Delgado Castillo, Francisco A. Ruiz Martínez (Universidad de
Cienfuegos). «Ideas físicas en el Medioevo». Archivado desde el originalel 12 de
enero de 2005. Consultado el 29 de enero de 2008.
3. Volver arriba↑ Michael Fowler (1995). «Isaac Newton» (en inglés). Consultado el
31 de enero de 2008.
4. Volver arriba↑ Rolando Delgado Castillo, Francisco A. Ruiz Martínez
(Universidad de Cienfuegos). «La física del siglo XVIII». Archivado desde el
original el 12 de enero de 2005. Consultado el 1 de febrero de 2008.
5. Volver arriba↑ Rolando Delgado Castillo, Francisco A. Ruiz Martínez
(Universidad de Cienfuegos). «Nuevo Paradigma electromagnético en el siglo
XIX». Archivado desde el original el 12 de enero de 2005. Consultado el 1 de
febrero de 2008.
Videos
The first video we have to take into account the things that used to create the amount of
water materials as spend mo build it, how will battle the way in which we will come out
better.
https://youtu.be/-1q1jSNP2ZY
In the second video will get water speakers and cables to do so.
https://youtu.be/qDG1qJ0bfds