On 6/23/13 10:48 PM, DaveH wrote:
Something a bit similar was first published by Nick Hood in 2007.
Here is a copy:
http://www.sciencebuddies.org/science-fair-projects/project_ideas/Phys_p056.
shtml
Here is Nick's website:
http://cullaloe.com/
Some people use marshmallows.
Dave
the only problem is that you don't have a very accurate measurement of
the microwave oven frequency and the mode pattern isn't very "sharp".
So this might get you 1 sig fig. Granted, most folks only use 1 sig fig
3E8 m/sec, but that's just a happenstance since c happens to be close to
a round number.
And that gets back to another time-nuts kind of question..
How accurately can you measure length and time? (in a science demo sort
of way.. without getting a Rb or GPSDO, etc.) For most school age kids,
the sources of time available are fairly lengthy (e.g. 1 second ticks
from wwv by phone, stopwatches built into iphones, etc.)
Tape measures and meter sticks are readily available.
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