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Semelhante a Fisika Dasar I - 17 (20)
Fisika Dasar I - 17
- 6. 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 7. Sound travels different speeds in different media. Sound typically travels faster in a solid that a liquid and faster in a liquid than a gas. The denser the medium, the faster sound will travel. The higher the temperature, the faster the particles of the medium will move and the faster the particles will carry the sound. 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 11. 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 17. The greater the intensity of sound the farther the sound will travel and the louder the sound will appear. Loudness is very closely related to intensity. Loudness is the human perception of the sound intensity. The unit for loudness is decibels . 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 20. The pitch of a sound wave is directly related to frequency . A high-pitched sound has a high frequency (a screaming girl). A low-pitched sound has a low frequency (a fog-horn). A healthy human ear can hear frequencies in the range of 20 Hz to 20,000 Hz . Humans cannot hear below 20 Hz. Sounds below this frequency are termed infrasonic . Sounds above 20,000 Hz are termed ultrasonic . Some animals, such as dogs, can hear frequencies in this range in which humans cannot hear. 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 21. 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
- 22. 01/02/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |
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