Bellwork Clear everything from desk except: o African American Scientist material o P / P Wait patiently & quietly for today’s African American Scientist.

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Presentation transcript:

Bellwork Clear everything from desk except: o African American Scientist material o P / P Wait patiently & quietly for today’s African American Scientist

Daniel Hale Williams was born in He opened the first African American owned hospital in the United States, as well as the first nursing school for African Americans. Dr. Williams employed African American and White doctors at his Hospital, emphasizing the need to provide the best available care to everyone. He required that the doctors keep up on the latest advances in medicine. Dr. Daniel Hale Williams made history by performing the first successful open heart surgery operation. Dr. Daniel Hale Williams

Bellwork o Clear everything from desk except: o P / P o Notebooks o Label the next entry “Sound Vocabulary” o Wait Patiently & Quietly with your head down or read

Sound Vocabulary

Sound – is a wave that is produced by a vibrating object and travels through matter (medium) o Sound is a mechanical wave

Vibration – a rapid back and forth movement

Medium – any substance that a wave moves through (solid, liquid or gas)

Speed of Sound – can be determined by the type of medium that it is moving through o Sound travels faster through liquids than gasses o Sound travels faster through solids than liquids

Materials / Mediums and The Speed of Sound Medium (42 o F) StateSpeed of Sound AirGas769 mi/h WaterLiquid3,130 mi/h SteelSolid5,000 mi/h

Frequency – the number of waves passing a fixed point in a given period of time (Hertz) High Frequency Wave: Low Frequency Wave: Low Frequency Wave:

Pitch – how high or how low sounds are o The frequency of a sound wave determines the pitch of the sound

Frequency & Pitch o A high frequency wave has short wavelengths. This makes a high pitched sound. Example: Trumpet o A low frequency wave has long wavelengths. This makes a low pitched sound. Example: Trombone

Intensity – the amount of energy carried by a wave o depends on the size of the wave

Intensity low frequency high frequency low frequency high frequency high intensity low intensity high intensity low intensity low amplitude high amplitude low amplitude high amplitude low intensity high intensity low intensity high intensity

Decibel (dB) – unit used to measure the intensity of a sound

The Ear Cochlea Auditory Nerve