Daily Science (pg. 52) 1. Name an example of a transverse wave and a longitudinal wave. 2. Put these numbers into scientific notation: 1. 0.0000000347.

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Presentation transcript:

Daily Science (pg. 52) 1. Name an example of a transverse wave and a longitudinal wave. 2. Put these numbers into scientific notation: Divide the following numbers x 10 8 / 6.7 x x / 1.07 x x / 8.1 x 10 -6

Sound Pg. 53

Properties of sound Sound waves- longitudinal waves that are caused by vibrations and travels through a medium Speed of sound-depends on the material and the temperature through which it travels Loudness-determined by intensity Intensity-the rate at which a sound wave transmits energy (depends on amplitude and distance from source).

Intensity Measured in decibels (dB) Threshold of hearing: quietest sound a human can hear (0 dB) Threshold of pain: sounds louder can cause deafness (120 dB). Ex. 30 dB- cat purring 50 dB- normal conversation 90 dB- lawn mower 150 dB- nearby jet airplane

Sound characteristics Pitch-measure of how high or low something sounds Higher frequency  higher pitch Any sound that has a frequency below human hearing is called infrasound. Any sound with a frequency above human hearing is called ultrasound.

Musical instruments Rely on standing waves The player controls the vibrations of the standing waves Instruments use resonance to amplify sound. Resonance-a phenomenon that occurs when two objects vibrate at the same frequency.

The Ear The ear senses vibrations, amplifies them, and transmits them to the brain. There are 3 regions: outer ear, middle ear, inner ear.

Ultrasound and Sonar Reflected waves are used to determine distances and to create images. Reflected waves from an ultrasound are put into a computer image called a sonogram. Sonar uses reflected waves to determine distance under water (calculates using the velocity equation). Bats use ultrasound to fly and locate food.

Pg Use page 549 in the book to help you label the parts of an ear. Describe IN YOUR OWN WORDS how sound travels through the ear. 2. Read the article on the corner of my desk. On pg. 54 summarize the article using 5 vocabulary words we have talked about. Include a paragraph on whether or not you think the experiment the scientists was ethical. Provide an example of something they could have done differently.