Friday, Feb 1, 2008 - 4B

Collected RA 11.1
Used notebooks to review previous class activities, especially the waveforms on the oscilloscope showing that long wavelength sounds are low frequency and low pitched and high frequency sounds are high pitched and short wavelength.

Reinforced these ideas with Singing Rod demo - several students gave it a try, and Duck Call Lab - again most students gave it a try. The basic idea behind both of these was that the short rod or short straw created short wavelengths which gave high frequency sounds and long rods or long straws created long wavelengths which gave lower frequency sounds.

Gave "Name that Sound" quiz.

Explained "Show me a Wave" Lab and then did the lab in the hallway working in pairs.
Students entered main ideas of lab in their notebooks:
Transverse vs Longitudinal waves
How to create waves of high and low frequency, high and low amplitude, long and short wavelength, high and low energy.
How to create standing waves and see nodes (places where the slinky does not move)

Handed out RA 11.2a. Gave students class time to work on it. If they didn't finish, it is homework due on Tuesday, Feb 5.