Chapter 4B Light and Sound
1. What is light?
The visible spectrum is light energy that can be seen. The sun, fire electric lights, candles, matches, and flashlights are all sources of light.
Light waves move in a straight line away from their source and can move through empty space.
2. When happens when light hits an object?
Light can be reflected, absorbed, or transmitted when it hits different materials, and the color of light that is reflected or transmitted gives objects their color.
Flat mirrors reflect good images, while curved mirrors reflect somewhat change images.
Lenses cause light rays to bend by changing their speed and direction.
3. How does sound travel?
Sound is made when matter is caused to vibrate.
Volume and pitch are properties of sound.
Sound waves travel through different materials at different speeds; they cannot travel through empty space.
4. How do you hear sound?
You hear sounds when sound waves cause vibrations to move through your eat to a nerve and the nerve then sends messages to the brain.
Stethoscopes, microphones, bullhorns, and hearing aids can be used to make sounds louder.
Visible spectrum light energy that can be seen and can be broken into the colors of the rainbow
Wavelength the distance from a point on a wave to the same point on the next wave
Transparent allows light to pass through so that whatever is behind can be seen
Translucent allow slight to pass through but scatters it so that whatever is behind it cannot be clearly seen
Opaque does not allow light to pass through
Transmit to allow to pass through
Absorb to take in
Reflect to bounce back
Convex lens a lens that is thicker in the middle than at the edges
Concave lens a lens that is thinner in the middle than at the edges
Vibrate to move quickly back and forth
Volume the loudness or softness of a sound
Pitch the highness or lowness of a sound
Stethoscope an instrument used to hear the sounds of body organs
Microphone an instrument used to amplify voices, music, and other sounds
Electric signal a form of energy
Amplify to make stronger
Bullhorn an instrument with a built-in microphone that makes sound louder
Hearing aid an instrument used to help people with a hearing problem hear better