The Piano

A Segment From: Physical Science: Sound

Grades: 6-8 Overall Rating: Not Yet Rated

20:00 Physical Science: Sound

1. 3:34 How We Hear

2. 3:08 Cochlear Implants: Technology for the Hearing Impaired

3. 2:25 Coping with Noise

4. 2:24 The Piano

5. 4:13 Infrasound and Echolocation: Animal Communication Through Sound

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Citation (MLA)

Physical Science: Sound. Discovery Channel School. 2002. Cosmeo. 20 November 2009

Citation (APA)

Physical Science: Sound. Discovery Channel School (2002). Retrieved November 20, 2009, from Cosmeo: http://www.cosmeo.com/

Citation (Chicago Manual of Style)

Discovery Channel School. "Physical Science: Sound."
Cosmeo. http://www.cosmeo.com/

DESCRIPTION

Sound is energy that travels in waves. Our ears are capable of receiving the waves and transmitting them through the eardrum and ear bones to the cochlea, which converts the vibrations into electrical impulses that the brain can interpret. People with hearing loss may benefit from a cochlear implant, a device that “assists” the ear electronically. Sound is measured in decibels—40 decibels is normal talking volume, while 120 is the sound of a plane taking off. Scientists have found ways to get rid of noise by using sound waves to mirror the noise waves and cancel them out. You would not want to cancel the sounds of a good pianist. When keys strike and vibrate strings inside a piano, the result is beautiful music. Sound is far more than music to many animals. For elephants, infrasound is a way to communicate across long distances. Bats use high-frequency sounds in echolocation. Their clicks bounce off objects, helping them navigate in darkness and find prey in the form of flying insects. Scientists suspect that bats may effectively be able to slow down time in order to process the echoes returning from their clicks. Now that is a superpower. Curriculum Explorer