How to Measure Light with Google’s Science Journal App

How to Measure Light with Google’s Science Journal App


You can use Google Science Journal to measure
light levels using your phone’s built-in light sensor. Enter observe mode by selecting the menu icon
in the upper left, select observe, and then select the light bulb icon. You can now measure light levels in lux, the
SI unit of light intensity. Meter mode displays the instantaneous reading. You can switch to graph mode to see how the
reading changes over time. In order to take accurate measurements, it
is important to find the exact location of the light sensor on your phone. You can do this by putting the phone under
a bright light, switching to graph mode, and slowly waving your finger around in front
of the phone. When your finger blocks the light sensor,
the value on the graph will drop. Conversely, you can try shining a flashlight
at the phone, and the reading will go up when you aim it directly at the light sensor. Try using the light sensor to do some simple
experiments, like measuring light levels at different times of day, or how the brightness
of a light bulb changes as you get farther away. To learn more about the Google Science Journal
app, including the other sensors that are available, see the rest of the videos in this
playlist. To view written directions for science projects
and lesson plans you can do with the app, visit us online at www.sciencebuddies.org.

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