| MadSci Network: Physics |
It is possible to measure the amount of photons (particles of light) your
patch of garden receives, using a photometer (which detects photon
intensity). See here
for a better definition.
So, using one of these, it is possible to infer the amount of sunlight in
your patch of garden using the following formula:
Intensity = Amount of photons/time elapsed
As you can see, the intensity depends on how long the light is measured and
how many photons are detected, the shorter the time for a given amount, the
lower the intensity.
That intensity is how much sunlight your garden patch has received.
Try the links in the MadSci Library for more information on Physics.