Como enxergar sua própria voz (EXPERIMENTOS de FÍSICA)

Summary

This video tutorial demonstrates how to create a simple device that allows you to visually observe your voice through sound vibrations. Using materials like a small can, a laser pen, a balloon, and a CD, the device projects laser patterns based on sound waves. The tutorial covers step-by-step instructions to assemble the device and explains how different frequencies of sound (e.g., high and low pitches) affect the vibration patterns. The video also explores sound science, showing how vocal cords create vibrations that can be seen with the right setup. It's an engaging DIY project for anyone interested in sound and physics.

Takeaways

• 😀 You can create a simple device that allows you to visualize your voice by using a laser and other common materials.
• 😀 The basic components needed for the project include a small can, a laser pointer, a balloon, a CD, and a piece of PVC pipe.
• 😀 Instead of using a mirror, a CD works well for reflecting the laser beam, with the shiny side providing better results.
• 😀 The balloon helps amplify sound vibrations, which are key to generating visual patterns when the sound is reflected by the laser beam.
• 😀 A PVC pipe can be used as a support for the laser to ensure it's stable and pointed correctly.
• 😀 A simple setup involves attaching a piece of the balloon to the can and placing a small CD piece on top of it.
• 😀 When sound is produced, it vibrates the air inside the balloon, causing it to shake and make the CD vibrate.
• 😀 The laser beam is reflected off the CD, and its movement creates different visual patterns based on the sound being emitted.
• 😀 Low-frequency (bass) sounds create larger, longer waves, while high-frequency (treble) sounds create smaller, shorter waves.
• 😀 The volume of your voice affects the size and intensity of the visual patterns; louder voices create larger and more intense waves.
• 😀 The device allows you to 'see' the sound waves, which is a fascinating way to visualize how sound travels and vibrates in real life.

Q & A

What is the main purpose of the device demonstrated in the video?

The device is designed to allow you to 'see' your own voice. It projects the sound waves produced by your voice onto a surface, using a laser and a mirror to create a visual representation of the sound vibrations.

What materials are needed to create the device?

To create the device, you will need a laser pen, a small tin can (such as one from tomato paste or condensed milk), a small piece of mirror (or CD as a substitute), a balloon, tape, and a piece of PVC pipe.

Why is a CD used instead of a traditional mirror?

A CD is used because it's easier to handle, and it works better for this experiment compared to a small mirror, which can be difficult to find and break easily.

How is the laser directed towards the mirror?

The laser is mounted on a PVC pipe in a V-shape. The laser is then taped securely onto the setup, with a switch to keep the laser continuously on.

What is the function of the balloon in the device?

The balloon serves as a flexible surface that vibrates when sound waves from your voice hit it. This vibration causes the attached CD (acting as a mirror) to also vibrate, reflecting the laser in different patterns.

How does the laser create a visual representation of sound?

When sound waves from your voice hit the balloon, they cause it to vibrate. The mirror (CD) attached to the balloon reflects the laser, and the laser's reflection changes its pattern depending on the vibrations, which visually represents the sound.

Why does the device display different patterns for different sounds?

Different sounds produce different vibration patterns. Low-frequency sounds (like bass) create longer waves, while high-frequency sounds (like treble) create shorter waves. The laser reflects these variations in the vibrations as different visual patterns.

What safety precautions should be taken when using the laser?

You should avoid directing the laser at people's faces, especially their eyes, as it could cause harm. It’s also important to never aim the laser at airplanes or in any way that could cause a safety hazard.

How does the speaker explain the difference in the visual patterns created by their voice and someone else's?

The speaker’s voice is deeper and louder, which produces longer sound waves that form bigger, more pronounced patterns. In contrast, the other person's voice is higher-pitched and softer, producing shorter and smaller patterns.

What additional resources are mentioned in the video for further exploration of sound?

The video mentions a slow-motion video of sound waves in action, where you can see how sound moves, and a video about creating a homemade flute using PVC pipes. Both resources delve deeper into the science of sound.