Sound
Objectives:
Vocabulary:
infrasonic, ultrasonic, pitch, compression, rarefraction
Questions:
Know the relationships among frequency, wavelength, and speed of sound traveling in various media.
What is the difference between sound waves traveling through the air, glass and through water? which do they travel the fastest in?
Electromagnetic waves can travel in a vacuum but can sound waves travel in a vacuum?
sound travels faster in warmer air
Dolphins get an overall image of objects in its surroundings from echoes of long-wavelength sound. To examine more detail, the dolphin emits sound of shorter wavelengths. Skin, muscle, and fat are almost transparent to dolphins, so they "see" a thin outline of the body. Bones, teeth, and gas-filled cavities are clearly apparent. Physical evidence of cancers, tumors, heart attacks, and even emotional states can all be "seen" by the dolphins. They can do naturally what humans can recently do with ultrasound. So the dolphin can communicate "sight" with other dolphins by sound. A dolphin's main diet is fish and, since hearing in fish is limited to fairly long wavelength, sound, they are not alerted to the fact that they are being hunted.
Long wavelengths diffract, or bend, readily around buildings and reach more places than shorter waves do so FM waves aren't received as well as AM radio waves are in mountain canyons or city canyons. TV waves behave behave much like FM waves.
Sound waves and music chapter: Physics Online Classroom
Objectives:
- Relate the pitch of a sound to its frequency
- Describe the movement of sound through air
- Compare the transmission of sound through air with that through solids, liquids, and a vacuum
- Describe loudness and sound intensity
- Describe natural frequency
- Describe resonance
- what concepts of sound are those also found in electromagnetism
- Describe how sound waves interfere with one another
Vocabulary:
infrasonic, ultrasonic, pitch, compression, rarefraction
Questions:
- Can sound travel in space?
- What does the speed of sound in a material depend upon?
- Does sound travel faster in hot or cold temperature?
Know the relationships among frequency, wavelength, and speed of sound traveling in various media.
What is the difference between sound waves traveling through the air, glass and through water? which do they travel the fastest in?
Electromagnetic waves can travel in a vacuum but can sound waves travel in a vacuum?
sound travels faster in warmer air
Dolphins get an overall image of objects in its surroundings from echoes of long-wavelength sound. To examine more detail, the dolphin emits sound of shorter wavelengths. Skin, muscle, and fat are almost transparent to dolphins, so they "see" a thin outline of the body. Bones, teeth, and gas-filled cavities are clearly apparent. Physical evidence of cancers, tumors, heart attacks, and even emotional states can all be "seen" by the dolphins. They can do naturally what humans can recently do with ultrasound. So the dolphin can communicate "sight" with other dolphins by sound. A dolphin's main diet is fish and, since hearing in fish is limited to fairly long wavelength, sound, they are not alerted to the fact that they are being hunted.
Long wavelengths diffract, or bend, readily around buildings and reach more places than shorter waves do so FM waves aren't received as well as AM radio waves are in mountain canyons or city canyons. TV waves behave behave much like FM waves.
Sound waves and music chapter: Physics Online Classroom